chore(deps): add cooldown to dependabot updates

[headless-samber]

Adds cooldown to each Dependabot update entry to avoid PR spam from freshly published versions.

• default-days: 7 for all ecosystems
• semver-major-days: 30 for ecosystems that support semver overrides

Security updates bypass the cooldown.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.64%. Comparing base (1fd9124) to head (90d9b12).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #970   +/-   ##
=======================================
  Coverage   93.64%   93.64%           
=======================================
  Files          32       32           
  Lines        5520     5520           
=======================================
  Hits         5169     5169           
  Misses        244      244           
  Partials      107      107           

Flag	Coverage Δ
unittests	93.64% <ø> (ø)

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