ci: use uv to install packages

[nijel]

Proposed changes

• use uv instead of pip for better peformance
• drop cache as uv cache is way bigger than pip

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[nijel]

CI runs faster even with caching disabled. Leaving caching out for upstream addressing, see following issues:

• Support for uv Package Manager Caching actions/setup-python#822
• Add support for caching uv actions/setup-python#818
• Best practices for using uv's cache in CI / Github Actions? astral-sh/uv#2231

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.52%. Comparing base (6aee586) to head (d84713d).
Report is 3411 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11679      +/-   ##
==========================================
- Coverage   90.82%   90.52%   -0.31%     
==========================================
  Files         554      572      +18     
  Lines       57306    58665    +1359     
  Branches     9122     9372     +250     
==========================================
+ Hits        52046    53104    +1058     
- Misses       3640     3854     +214     
- Partials     1620     1707      +87     

see 256 files with indirect coverage changes