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 85.33%. Comparing base (fd7b198) to head (523dda3).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #117   +/-   ##
=======================================
  Coverage   85.33%   85.33%           
=======================================
  Files          28       28           
  Lines        2210     2210           
=======================================
  Hits         1886     1886           
  Misses        271      271           
  Partials       53       53           

Flag	Coverage Δ
unittests	85.33% <ø> (ø)

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