Dependency upgrades & minor CI renovation

[akx]

• Ensure that users get new versions of transitive deps
• Upgrade lint tools & fix things so they don't complain
• Speed up CI by using uv
• Fix Codecov reporting (token was missing; that had worked before, not so anymore)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.13%. Comparing base (59dc814) to head (ea20c13). Report is 16 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #318 +/- ## ========================================== - Coverage 86.85% 86.13% -0.73% ========================================== Files 126 129 +3 Lines 4374 4593 +219 Branches 903 591 -312 ========================================== + Hits 3799 3956 +157 - Misses 394 446 +52 - Partials 181 191 +10 ```

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