fix: support free-threaded python and latest pbs-installer

[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 61.53846% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.59%. Comparing base (ec77dfd) to head (5b01c63).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/cli/commands/python.py	58.33%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3201      +/-   ##
==========================================
- Coverage   85.63%   85.59%   -0.04%     
==========================================
  Files         112      112              
  Lines       11215    11222       +7     
  Branches     2432     2434       +2     
==========================================
+ Hits         9604     9606       +2     
- Misses       1098     1101       +3     
- Partials      513      515       +2     

Flag	Coverage Δ
unittests	85.40% <61.53%> (-0.04%)	⬇️

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