Compatibility with Sphinx dev for autodoc attribute

[pllim]

Fix #222 based on sphinx-doc/sphinx#14009

[codecov]

Codecov Report

❌ Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.22%. Comparing base (1b47aca) to head (3ebf769).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
sphinx_automodapi/autodoc_enhancements.py	30.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
- Coverage   89.69%   89.22%   -0.48%     
==========================================
  Files          31       31              
  Lines        1262     1271       +9     
==========================================
+ Hits         1132     1134       +2     
- Misses        130      137       +7     

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[pllim]

Hmm doing it in what I thought was the correct way, I get this:

      File "sphinx/events.py", line 402, in emit
        raise ExtensionError(
        ...<4 lines>...
        ) from exc
    sphinx.errors.ExtensionError: Handler <function process_automodsumm_generation at 0x7f0044925440>
        for event 'builder-inited' threw an exception (exception: 'class')

Now I should try the hacky way.

[pllim]

Nope... Also I cannot easily hack-fix this because the inner API has changed upstream:

def _process_documenter_options(
    *,
-    option_spec: OptionSpec,
+    obj_type: _AutodocObjType,

I am starting to be worried that sphinx-automodapi will have to max pin sphinx to work at this point.