fix: Can't install editable packages with PDM installed on 3.13

[frostming]

Fixes #3444

Signed-off-by: Frost Ming me@frostming.com

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 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.57%. Comparing base (2d8b02d) to head (6b91683).
Report is 77 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/models/candidates.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3449      +/-   ##
==========================================
- Coverage   85.60%   85.57%   -0.03%     
==========================================
  Files         112      112              
  Lines       11553    11552       -1     
  Branches     2535     2535              
==========================================
- Hits         9890     9886       -4     
- Misses       1133     1136       +3     
  Partials      530      530              

Flag	Coverage Δ
unittests	85.37% <75.00%> (-0.03%)	⬇️

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