Add grouping and ignore rules for Dependabot

[svchb]

Implement #1004

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.58%. Comparing base (0558fee) to head (a37ab28).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1008   +/-   ##
=======================================
  Coverage   89.58%   89.58%           
=======================================
  Files         120      120           
  Lines        8628     8628           
=======================================
  Hits         7729     7729           
  Misses        899      899           

Flag	Coverage Δ
total	89.58% <ø> (ø)
unit	64.79% <ø> (ø)

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[efaulhaber]

What does this have to do with #1007?