fix(dependabot): rename label uv to uv.lock

[woutervh]

Summary

• Renames the uv label to uv.lock in dependabot.yml
• The uv label did not exist in the repo, causing Dependabot to block itself from opening/labeling PRs
• The uv.lock label has been created in the repo

Test plan

• Verify Dependabot no longer complains about missing labels on new PRs
• Existing open Dependabot PRs can be rebased and should auto-merge (minor/patch ones)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6bf9f2e) to head (a26db77).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #100   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           24        24           
=========================================
  Hits            24        24           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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