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 91.20%. Comparing base (74199a3) to head (6dd41a0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   91.20%   91.20%           
=======================================
  Files          15       15           
  Lines        1251     1251           
=======================================
  Hits         1141     1141           
  Misses         88       88           
  Partials       22       22           

Flag	Coverage Δ
unittests	91.20% <ø> (ø)

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