Group Dependabot updates

[samdark]

Replicates the Dependabot grouping configuration from yiisoft/package-template so GitHub Actions updates are grouped into a single PR and Composer dependency updates are grouped into a single PR.

[Copilot]

Pull request overview

Note

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Adds Dependabot grouping so GitHub Actions updates and Composer dependency updates are bundled into single PRs (mirroring yiisoft/package-template).

Changes:

• Group all GitHub Actions updates into one grouped PR; adjust schedule to weekly.
• Group all Composer dependency updates into one grouped PR; keep schedule daily.
• Add ignore rule for yiisoft/* in GitHub Actions updates.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (939a7eb) to head (23ee080).

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #83   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        26        26           
===========================================
  Files              1         1           
  Lines             59        59           
===========================================
  Hits              59        59           

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