refactor: dep-logic for python specifier logic

[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 73.55372% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 84.72%. Comparing base (0275813) to head (6817503).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/pdm/models/specifiers.py	71.81%	18 Missing and 13 partials ⚠️
src/pdm/cli/utils.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2648      +/-   ##
==========================================
- Coverage   84.79%   84.72%   -0.07%     
==========================================
  Files         104      104              
  Lines       10396    10277     -119     
  Branches     2275     2233      -42     
==========================================
- Hits         8815     8707     -108     
+ Misses       1106     1100       -6     
+ Partials      475      470       -5     

Flag	Coverage Δ
unittests	84.50% <73.55%> (-0.08%)	⬇️

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