Add renovate groups.

[pixlwave]

This should reduce the number of PRs we receive.

See https://docs.renovatebot.com/configuration-options/#groupname

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.72%. Comparing base (2f70d58) to head (8d70bfc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   96.72%   96.72%           
=======================================
  Files          18       18           
  Lines        1253     1253           
=======================================
  Hits         1212     1212           
  Misses         41       41           

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