fix: improve the error message when encountering an invalid requirement

[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.

Close #1765

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (ba3c22d) 85.08% compared to head (1936c72) 85.06%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1766      +/-   ##
==========================================
- Coverage   85.08%   85.06%   -0.02%     
==========================================
  Files          92       92              
  Lines        8669     8672       +3     
  Branches     1874     1875       +1     
==========================================
+ Hits         7376     7377       +1     
- Misses        871      873       +2     
  Partials      422      422              

Flag	Coverage Δ
unittests	84.88% <100.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
src/pdm/models/requirements.py	93.06% <100.00%> (-0.53%)	⬇️

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