fix: pdm does not update a @ file:/// dependency

[frostming]

Fixes #2169

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-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.03% ⚠️

Comparison is base (446f2af) 84.28% compared to head (66c969e) 84.26%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2173      +/-   ##
==========================================
- Coverage   84.28%   84.26%   -0.03%     
==========================================
  Files         100      100              
  Lines        9777     9780       +3     
  Branches     2159     2160       +1     
==========================================
  Hits         8241     8241              
- Misses       1062     1065       +3     
  Partials      474      474              

Flag	Coverage Δ
unittests	84.03% <0.00%> (-0.03%)	⬇️

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

Files Changed	Coverage Δ
src/pdm/installers/synchronizers.py	83.44% <0.00%> (-0.86%)	⬇️

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