[CI] Add github-actions ecosystem to Dependabot

[jbampton]

Group updates to reduce repo noise

Setup to run weekly.

Added 7 day cooldown period

https://docs.github.com/en/code-security/reference/supply-chain-security/dependabot-options-reference

Description

This PR...

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.94%. Comparing base (93239e0) to head (9decc77).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12823      +/-   ##
============================================
- Coverage     17.95%   17.94%   -0.01%     
+ Complexity    16259    16256       -3     
============================================
  Files          5954     5954              
  Lines        534838   534838              
  Branches      65423    65423              
============================================
- Hits          96010    96000      -10     
- Misses       428053   428063      +10     
  Partials      10775    10775              

Flag	Coverage Δ
uitests	3.65% <ø> (ø)
unittests	19.06% <ø> (-0.01%)	⬇️

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[jbampton]

refs #12164

[DaanHoogland]

@jbampton , would it be possible to run only if org/repo is apache/cloudstack and if branch in {main, 22, …} ?