ci: add cooldown settings to dependabot configuration

[steveoh]

This PR adds cooldown settings to the dependabot configuration for all package ecosystems.

What this does:

• Allows dependabot to delay including dependencies for a configurable number of days.

Benefits:

• The community finds supply chain vulnerabilities and bugs before they are included in a pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (59d8c6a) to head (3db66a6).
⚠️ Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #60   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines            9         8    -1     
=========================================
- Hits             9         8    -1     

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