Improve typing for under_cached_property decorator

[bdraco]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.27%. Comparing base (825020d) to head (9194479).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/propcache/_helpers_py.py	90.90%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   88.38%   88.27%   -0.11%     
==========================================
  Files          17       17              
  Lines         680      691      +11     
  Branches       63       67       +4     
==========================================
+ Hits          601      610       +9     
  Misses         63       63              
- Partials       16       18       +2     

Flag	Coverage Δ
CI-GHA	88.27% <90.90%> (-0.11%)	⬇️
MyPy	72.31% <59.09%> (+0.05%)	⬆️
OS-Linux	98.37% <92.30%> (-0.32%)	⬇️
OS-Windows	93.60% <92.30%> (-0.34%)	⬇️
OS-macOS	94.13% <92.30%> (-0.29%)	⬇️
Py-3.10.11	92.83% <84.61%> (-0.61%)	⬇️
Py-3.10.15	95.43% <84.61%> (-0.63%)	⬇️
Py-3.11.10	95.43% <84.61%> (-0.63%)	⬇️
Py-3.11.9	92.83% <84.61%> (-0.61%)	⬇️
Py-3.12.6	95.43% <84.61%> (-0.63%)	⬇️
Py-3.13.0-rc.3	95.43% <84.61%> (-0.63%)	⬇️
Py-3.8.10	93.13% <84.61%> (-0.62%)	⬇️
Py-3.8.18	95.75% <84.61%> (-0.63%)	⬇️
Py-3.9.13	92.81% <84.61%> (-0.62%)	⬇️
Py-3.9.20	95.42% <84.61%> (-0.63%)	⬇️
Py-pypy7.3.11	95.47% <84.61%> (-0.73%)	⬇️
Py-pypy7.3.16	95.09% <84.61%> (-0.73%)	⬇️
Py-pypy7.3.17	95.11% <84.61%> (-0.73%)	⬇️
VM-macos-latest	94.13% <92.30%> (-0.29%)	⬇️
VM-ubuntu-latest	98.37% <92.30%> (-0.32%)	⬇️
VM-windows-latest	93.60% <92.30%> (-0.34%)	⬇️
pytest	98.37% <92.30%> (-0.32%)	⬇️

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