chore: enable Renovate automerge

[timvw]

Enable automerge so dependency PRs merge automatically when CI passes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.14%. Comparing base (802916a) to head (c8d68d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   29.10%   29.14%   +0.03%     
==========================================
  Files          27       27              
  Lines        2714     2714              
==========================================
+ Hits          790      791       +1     
+ Misses       1845     1843       -2     
- Partials       79       80       +1     

see 1 file with indirect coverage changes

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