fix: use stdlib url<->path conversion

[frostming]

Signed-off-by: Frost Ming [email protected]

Pull Request Checklist

• 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.

[codecov]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.23%. Comparing base (e29740f) to head (991f21f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/models/backends.py	66.66%	2 Missing ⚠️
src/pdm/models/requirements.py	88.88%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3364      +/-   ##
==========================================
- Coverage   85.23%   85.23%   -0.01%     
==========================================
  Files         112      112              
  Lines       11470    11467       -3     
  Branches     2510     2510              
==========================================
- Hits         9777     9774       -3     
  Misses       1168     1168              
  Partials      525      525              

Flag	Coverage Δ
unittests	85.03% <88.57%> (-0.01%)	⬇️

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