Prefer file url requirements when resolving

[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.

Close #799

[codecov-commenter]

Codecov Report

Merging #800 (f1950c1) into main (911a414) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #800      +/-   ##
==========================================
+ Coverage   83.41%   83.42%   +0.01%     
==========================================
  Files          73       73              
  Lines        6203     6208       +5     
  Branches     1117     1119       +2     
==========================================
+ Hits         5174     5179       +5     
  Misses        735      735              
  Partials      294      294              

Flag	Coverage Δ
unittests	83.21% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
pdm/project/config.py	96.11% <ø> (ø)
pdm/resolver/providers.py	96.00% <100.00%> (ø)
pdm/resolver/reporters.py	97.72% <100.00%> (+0.29%)	⬆️

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