pin importlib-metadata for python 3.7 and under

[mshafer-NI]

(also update development poetry.lock)

Why:

Modules started failing to run ni-python-styleguide with

Traceback (most recent call last):
  File "~\pyenv-win\versions\3.7.9\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "~\pyenv-win\versions\3.7.9\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File ".venv\Scripts\ni-python-styleguide.exe\__main__.py", line 7, in <module>
  File ".venv\lib\site-packages\click\core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File ".venv\lib\site-packages\click\core.py", line 1055, in main
    rv = self.invoke(ctx)
  File ".venv\lib\site-packages\click\core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File ".venv\lib\site-packages\click\core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File ".venv\lib\site-packages\click\core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File ".venv\lib\site-packages\click\decorators.py", line 38, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File ".venv\lib\site-packages\ni_python_styleguide\_cli.py", line 135, in lint
    file_or_dir=file_or_dir,
  File ".venv\lib\site-packages\ni_python_styleguide\_lint.py", line 26, in lint
    app.run(list(filter(bool, args)))
  File ".venv\lib\site-packages\flake8\main\application.py", line 363, in run
    self._run(argv)
  File ".venv\lib\site-packages\flake8\main\application.py", line 350, in _run
    self.initialize(argv)
  File ".venv\lib\site-packages\flake8\main\application.py", line 330, in initialize
    self.find_plugins(config_finder)
  File ".venv\lib\site-packages\flake8\main\application.py", line 153, in find_plugins
    self.check_plugins = plugin_manager.Checkers(local_plugins.extension)
  File ".venv\lib\site-packages\flake8\plugins\manager.py", line 357, in __init__
    self.namespace, local_plugins=local_plugins
  File ".venv\lib\site-packages\flake8\plugins\manager.py", line 238, in __init__
    self._load_entrypoint_plugins()
  File ".venv\lib\site-packages\flake8\plugins\manager.py", line 254, in _load_entrypoint_plugins
    eps = importlib_metadata.entry_points().get(self.namespace, ())
AttributeError: 'EntryPoints' object has no attribute 'get'

It appears this is caused by a breaking change in the 5.0.0 release of importlib-metadata. (removing a deprecated entry point) [source - reference]

In our testing, this does not affect Python 3.8 or .9, so choosing to not pin it for those versions.

Testing:

Reproduced the error locally by installing latest ni-python-styleguide and attempting to lint.

Tested fix by using pip to install from local copy (after applying pin to pyproject.toml) and verified that ni-python-styleguide was now able to run on the project.

[github-actions]

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