fix: add python prefix to the self update command on Windows

[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-commenter]

Codecov Report

Patch coverage: 45.45% and project coverage change: -0.02 ⚠️

Comparison is base (77190c4) 85.26% compared to head (cfa00e3) 85.24%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1972      +/-   ##
==========================================
- Coverage   85.26%   85.24%   -0.02%     
==========================================
  Files          99       99              
  Lines        9249     9259      +10     
  Branches     2015     2019       +4     
==========================================
+ Hits         7886     7893       +7     
  Misses        926      926              
- Partials      437      440       +3     

Flag	Coverage Δ
unittests	85.04% <36.36%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
src/pdm/cli/actions.py	79.70% <45.45%> (-1.00%)	⬇️

... and 1 file with indirect coverage changes

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