fix: publish of argilla-server Python package to PyPI using wrong Python version

[jfcalvo]

Description

Looks like a bug on setup-pdm action was not correctly reading the Python version from pyproject.toml and causing to use the default version from ubuntu-latest container (v3.12 for this case).

Upgrading from pdm-project/setup-pdm@v3 to pdm-project/setup-pdm@v4 looks like fixing the issue.

Type of change

(Please delete options that are not relevant. Remember to title the PR according to the type of change)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (change restructuring the codebase without changing functionality)
• Improvement (change adding some improvement to an existing functionality)
• Documentation update

How Has This Been Tested

• Python package should be correctly build and pushed to PyPI

Checklist

• I added relevant documentation
• follows the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I filled out the contributor form (see text above)
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8dabc0a) 91.71% compared to head (705f470) 91.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #9   +/-   ##
=======================================
  Coverage   91.71%   91.71%           
=======================================
  Files         170      170           
  Lines        8651     8651           
=======================================
  Hits         7934     7934           
  Misses        717      717           

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