Add dependabot cooldown of 7 days

[greschd]

Wait for 7 days before opening a PR for a newly released dependency version.

This reduces the supply chain attach risk for threats which are identified quickly after release.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.86%. Comparing base (ebcd075) to head (f7de645).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #610      +/-   ##
==========================================
+ Coverage   89.79%   89.86%   +0.07%     
==========================================
  Files          54       54              
  Lines        4213     4213              
==========================================
+ Hits         3783     3786       +3     
+ Misses        430      427       -3     

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