build: use groups in dependabot.yml

[icweaver]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.47%. Comparing base (2edd8b7) to head (29b73dd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   93.47%   93.47%           
=======================================
  Files           8        8           
  Lines         598      598           
=======================================
  Hits          559      559           
  Misses         39       39           

Flag	Coverage Δ
unittests	93.47% <ø> (ø)

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