ci: Remove upgrade of wheel

[matthewfeickert]

Description

• Remove upgrading of wheel from CI workflows.
  • For dependencies that don't provide a wheel, and don't have build-system metadata in pyproject.toml, modern setuptools has integrated wheel and so installation is unnecessary.
  • c.f. docs: Add a note about historical wheel use in requires pypa/setuptools#3859
• Remove uv pip install --system --upgrade pip as uv pip is a different program.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Remove upgrading of wheel from CI workflows.
   - For dependencies that don't provide a wheel, and don't have build-system
     metadata in pyproject.toml, modern setuptools has integrated wheel and so
     installation is unnecessary.
* Remove 'uv pip install --system --upgrade pip' as 'uv pip' is a different
  program.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.21%. Comparing base (aab3468) to head (8a1a7ae).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2542   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files          69       69           
  Lines        4543     4543           
  Branches      804      804           
=======================================
  Hits         4462     4462           
  Misses         48       48           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.79% <ø> (ø)
doctest	98.08% <ø> (ø)
unittests-3.10	96.23% <ø> (ø)
unittests-3.11	96.23% <ø> (ø)
unittests-3.12	96.23% <ø> (ø)
unittests-3.8	96.25% <ø> (ø)
unittests-3.9	96.27% <ø> (ø)

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