Fix #5211: autodoc: No docs generated for functools.partial functions

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: No docs generated for functools.partial functions #5211

[codecov]

Codecov Report

Merging #5305 into 1.7 will increase coverage by <.01%.
The diff coverage is 90.24%.

@@            Coverage Diff             @@
##              1.7    #5305      +/-   ##
==========================================
+ Coverage   82.04%   82.05%   +<.01%     
==========================================
  Files         288      289       +1     
  Lines       38221    38248      +27     
  Branches     5933     5934       +1     
==========================================
+ Hits        31360    31383      +23     
- Misses       5540     5542       +2     
- Partials     1321     1323       +2

Impacted Files	Coverage Δ
sphinx/util/inspect.py	76.1% <100%> (+0.7%)	⬆️
tests/test_autodoc.py	96.35% <100%> (+0.07%)	⬆️
sphinx/ext/autodoc/__init__.py	84.32% <66.66%> (-0.31%)	⬇️
...s/roots/test-ext-autodoc/target/partialfunction.py	83.33% <83.33%> (ø)
sphinx/builders/html.py	82.42% <0%> (-0.12%)	⬇️

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