Fix python-version for astral-sh/setup-uv action

[bieniu]

Related to: https://github.com/home-assistant-libs/aioshelly/actions/runs/21342855594/job/61425052272

uv documentation: https://docs.astral.sh/uv/concepts/python-versions/#requesting-a-version

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.55%. Comparing base (89c5aea) to head (65b2734).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1044   +/-   ##
=======================================
  Coverage   78.55%   78.55%           
=======================================
  Files          20       20           
  Lines        2056     2056           
=======================================
  Hits         1615     1615           
  Misses        441      441           

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