fix: test against the latest findpython

[frostming]

Pull Request Check List

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Fix #1516

[codecov-commenter]

Codecov Report

Base: 85.30% // Head: 85.30% // No change to project coverage 👍

Coverage data is based on head (f8ec8b7) compared to base (26f2a17).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1518   +/-   ##
=======================================
  Coverage   85.30%   85.30%           
=======================================
  Files          91       91           
  Lines        8000     8000           
  Branches     1898     1897    -1     
=======================================
  Hits         6824     6824           
  Misses        786      786           
  Partials      390      390           

Flag	Coverage Δ
unittests	85.12% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pdm/cli/actions.py	78.50% <100.00%> (-0.16%)	⬇️
src/pdm/models/python.py	94.73% <100.00%> (+0.29%)	⬆️

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