Add a default cooldown of 7 days for GitHub Action updates

[dkotter]

What?

Adds a default cooldown of 7 days for GitHub Action updates via Dependabot.

Why?

Ensure Dependabot doesn't prompt us to update a package that was updated recently, leading to a higher risk for exploits.

See WordPress/performance#2277 for more details.

How?

Adds a cooldown config option for GitHub Action updates. Note we already have a cooldown option set for composer and npm updates

Use of AI Tools

None

Testing Instructions

n/a

Changelog Entry

Developer - Add a 7 day cooldown period for GitHub Action updates triggered by Dependabot.

[github-actions]

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Co-authored-by: dkotter <dkotter@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.20%. Comparing base (de6371e) to head (819f9d4).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #553   +/-   ##
==========================================
  Coverage      71.20%   71.20%           
  Complexity      1150     1150           
==========================================
  Files             67       67           
  Lines           5563     5563           
==========================================
  Hits            3961     3961           
  Misses          1602     1602           

Flag	Coverage Δ
unit	71.20% <ø> (ø)

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