Update Python publishing workflow

[GitBib]

Description

This pull request updates the Python publishing workflow by splitting the build, release upload, and PyPI publish steps into separate actions. This change improves modularity and execution clarity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.60%. Comparing base (07648f0) to head (a10d7e2).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #37   +/-   ##
=======================================
  Coverage   99.60%   99.60%           
=======================================
  Files           5        5           
  Lines         254      254           
=======================================
  Hits          253      253           
  Misses          1        1           

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