chore: add dependabot cooldown and grouping

[juliansteenbakker]

Description

Fix default files, adds dependabot grouping to reduce PR's

Checklist

• The PR title follows Conventional Commits (e.g. feat: ..., fix: ..., chore: ...) — this is required by CI and drives the automated changelog/release.
• (Optional) Each individual commit also follows Conventional Commits — if so, we'll merge with a real merge commit to preserve your full history; otherwise we'll squash the PR into one commit.
• Tests were added or updated, if applicable.
• Documentation (README.md) was updated, if applicable.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.85%. Comparing base (c594d20) to head (f3f9b13).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1798   +/-   ##
========================================
  Coverage    62.85%   62.85%           
========================================
  Files           48       48           
  Lines         1233     1233           
========================================
  Hits           775      775           
  Misses         458      458           

Flag	Coverage Δ
unittests	62.85% <ø> (ø)

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