Update mypy check for matplotlib 3.8

[bmcfee]

When type annotations were added in #1587 and #1632 , we had to punt on matplotlib imports:

librosa/setup.cfg

Lines 135 to 136 in 43d4427

	[mypy-matplotlib.*]
	ignore_missing_imports = True

Matplotlib 3.8 release notes mention that type hints are now provided for most public APIs: https://matplotlib.org/stable/users/prev_whats_new/whats_new_3.8.0.html#type-hints

Once 3.8 finishes rolling out on conda(-forge), we should be able to update the lint CI environment and remove the matplotlib skip from our setup.cfg. This will require us to bump the minimum mpl version in our CI environment spec.

[bmcfee]

Taking a first whack at this, failures are plentiful:

librosa/display.py:152: error: Item "None" of "Axis | _DummyAxis | _AxisWrapper | None" has no attribute
"get_data_interval"  [union-attr]
            _, dmax = self.axis.get_data_interval()
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:153: error: Item "None" of "Axis | _DummyAxis | _AxisWrapper | None" has no attribute
"get_view_interval"  [union-attr]
            vmin, vmax = self.axis.get_view_interval()
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:245: error: Item "None" of "Axis | _DummyAxis | _AxisWrapper | None" has no attribute
"get_view_interval"  [union-attr]
            vmin, vmax = self.axis.get_view_interval()
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:331: error: Item "None" of "Axis | _DummyAxis | _AxisWrapper | None" has no attribute
"get_view_interval"  [union-attr]
            vmin, vmax = self.axis.get_view_interval()
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:423: error: Item "None" of "Axis | _DummyAxis | _AxisWrapper | None" has no attribute
"get_view_interval"  [union-attr]
            vmin, vmax = self.axis.get_view_interval()
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:476: error: Item "None" of "Axis | _DummyAxis | _AxisWrapper | None" has no attribute
"get_view_interval"  [union-attr]
            vmin, vmax = self.axis.get_view_interval()
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:785: error: Unsupported operand types for <= ("float" and
"_SupportsArray[dtype[Any]]")  [operator]
                if start <= data[0] or end >= data[-1]:
                   ^
librosa/display.py:785: error: Unsupported operand types for <= ("float" and
"_NestedSequence[_SupportsArray[dtype[Any]]]")  [operator]
                if start <= data[0] or end >= data[-1]:
                   ^
librosa/display.py:785: error: Unsupported operand types for <= ("float" and "str")  [operator]
                if start <= data[0] or end >= data[-1]:
                   ^
librosa/display.py:785: error: Unsupported operand types for <= ("float" and "complex")  [operator]
                if start <= data[0] or end >= data[-1]:
                   ^
librosa/display.py:785: error: Unsupported operand types for <= ("float" and "bytes")  [operator]
                if start <= data[0] or end >= data[-1]:
                   ^
librosa/display.py:785: error: Unsupported operand types for <= ("float" and
"_NestedSequence[bool | int | float | complex | str | bytes]")  [operator]
                if start <= data[0] or end >= data[-1]:
                   ^
librosa/display.py:785: note: Right operand is of type "Any | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | str | int | float | complex | bytes | _NestedSequence[bool | int | float | complex | str | bytes]"
librosa/display.py:785: error: Value of type
"_SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes]"
is not indexable  [index]
                if start <= data[0] or end >= data[-1]:
                            ^~~~~~~
librosa/display.py:785: error: Unsupported operand types for >= ("float" and
"_SupportsArray[dtype[Any]]")  [operator]
                if start <= data[0] or end >= data[-1]:
                                       ^
librosa/display.py:785: error: Unsupported operand types for >= ("float" and
"_NestedSequence[_SupportsArray[dtype[Any]]]")  [operator]
                if start <= data[0] or end >= data[-1]:
                                       ^
librosa/display.py:785: error: Unsupported operand types for >= ("float" and "str")  [operator]
                if start <= data[0] or end >= data[-1]:
                                       ^
librosa/display.py:785: error: Unsupported operand types for >= ("float" and "complex")  [operator]
                if start <= data[0] or end >= data[-1]:
                                       ^
librosa/display.py:785: error: Unsupported operand types for >= ("float" and "bytes")  [operator]
                if start <= data[0] or end >= data[-1]:
                                       ^
librosa/display.py:785: error: Unsupported operand types for >= ("float" and
"_NestedSequence[bool | int | float | complex | str | bytes]")  [operator]
                if start <= data[0] or end >= data[-1]:
                                       ^
librosa/display.py:801: error: Item "None" of "Figure | SubFigure | None" has no attribute "canvas" 
[union-attr]
            ax.figure.canvas.draw_idle()
            ^~~~~~~~~~~~~~~~
librosa/display.py:1394: error: Argument 1 to "FixedLocator" has incompatible type
"ndarray[Any, dtype[floating[Any]]]"; expected "Sequence[float]"  [arg-type]
            axis.set_major_locator(mplticker.FixedLocator(np.arange(6.0)))
                                                          ^~~~~~~~~~~~~~
librosa/display.py:1401: error: Argument 1 to "FixedLocator" has incompatible type
"ndarray[Any, dtype[Any]]"; expected "Sequence[float]"  [arg-type]
                mplticker.FixedLocator(np.add.outer(12 * np.arange(10), degrees).ravel())
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:1417: error: Argument 1 to "FixedLocator" has incompatible type
"ndarray[Any, dtype[Any]]"; expected "Sequence[float]"  [arg-type]
                mplticker.FixedLocator(np.add.outer(12 * np.arange(10), degrees).ravel())
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:1431: error: Argument 1 to "FixedLocator" has incompatible type
"ndarray[Any, dtype[Any]]"; expected "Sequence[float]"  [arg-type]
                mplticker.FixedLocator(np.add.outer(12 * np.arange(10), degrees).ravel())
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:1475: error: Argument 1 to "FixedLocator" has incompatible type "ndarray[Any, Any]";
expected "Sequence[float]"  [arg-type]
            axis.set_major_locator(mplticker.FixedLocator(degrees))
                                                          ^~~~~~~
librosa/display.py:1572: error: Argument 1 to "FixedLocator" has incompatible type "ndarray[Any, Any]";
expected "Sequence[float]"  [arg-type]
                    core.interval_frequencies(
                    ^
librosa/display.py:1593: error: Argument "subs" to "LogLocator" has incompatible type
"ndarray[Any, Any]"; expected "Literal['auto', 'all'] | Sequence[float] | None"  [arg-type]
                    subs=core.interval_frequencies(
                         ^
librosa/display.py:1611: error: Argument "subs" to "LogLocator" has incompatible type
"ndarray[Any, Any]"; expected "Literal['auto', 'all'] | Sequence[float] | None"  [arg-type]
                    subs=core.interval_frequencies(
                         ^
librosa/display.py:1640: error: Argument "subs" to "LogLocator" has incompatible type
"ndarray[Any, dtype[floating[Any]]]"; expected "Literal['auto', 'all'] | Sequence[float] | None" 
[arg-type]
                mplticker.LogLocator(base=2.0, subs=2.0 ** (np.arange(1, 12) / 12.0))
                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
librosa/display.py:2058: error: Incompatible types in assignment (expression has type
"Callable[[_SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | bool | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes], _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | bool | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes] | float, _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | bool | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes] | float, Sequence[bool] | None, Literal['pre', 'post', 'mid'] | None, bool, DefaultNamedArg(Any, 'data'), KwArg(Any)], PolyCollection]",
variable has type
"Callable[[_SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | bool | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes], _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | bool | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes] | float, _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | bool | int | float | complex | str | bytes | _NestedSequence[bool | int | float | complex | str | bytes] | float, Sequence[bool] | None, bool, Literal['pre', 'post', 'mid'] | None, DefaultNamedArg(Any, 'data'), KwArg(Any)], PolyCollection]")
 [assignment]
            filler = axes.fill_betweenx
                     ^~~~~~~~~~~~~~~~~~
librosa/display.py:2060: error: Incompatible types in assignment (expression has type "YAxis", variable
has type "XAxis")  [assignment]
            dec_axis = axes.yaxis
                       ^~~~~~~~~~
librosa/display.py:2062: error: Argument "where" to "step" of "Axes" has incompatible type "str";
expected "Literal['pre', 'post', 'mid']"  [arg-type]
        (steps,) = axes.step(xdata, ydata, marker=marker, where=where, **kwargs)
                                                                ^~~~~
librosa/display.py:2072: error: Argument "step" has incompatible type "str"; expected
"Literal['pre', 'post', 'mid'] | None"  [arg-type]
            step=where,
                 ^~~~~
Found 33 errors in 1 file (checked 35 source files)