CI: adopt beta dependabot support for uv

[EdmundGoodman]

Dependabot has added beta support for uv. This PR updates the dependabot configuration to use uv instead of pip.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.16%. Comparing base (b4ec8eb) to head (b4365c1).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3992      +/-   ##
==========================================
+ Coverage   90.13%   90.16%   +0.03%     
==========================================
  Files         458      458              
  Lines       58317    58291      -26     
  Branches     5706     5691      -15     
==========================================
- Hits        52563    52559       -4     
+ Misses       4349     4340       -9     
+ Partials     1405     1392      -13     

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[superlopuh]

This is great but I would give them about a month to fix bugs before merging to xDSL