chore(ci): use a custom action to setup uv & nox

[mayeut]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 48 untouched benchmarks

---

_{Comparing custom-setup-nox (fefc552) with master (e801320)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.55%. Comparing base (e801320) to head (fefc552).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1008   +/-   ##
=======================================
  Coverage   99.55%   99.55%           
=======================================
  Files          11       11           
  Lines        1797     1797           
  Branches      276      276           
=======================================
  Hits         1789     1789           
  Partials        8        8           

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