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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Updates Dependabot configuration to group version-update PRs similarly to yiisoft/package-template, reducing PR noise by combining GitHub Actions updates into one PR and Composer dependency updates into one PR.

Changes:

• Added a Dependabot group for all github-actions updates.
• Added a Dependabot group for all Composer dependency updates.
• Adjusted indentation/structure around the Composer schedule block to keep the YAML valid and consistent.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (3c7edfc) to head (3dde930).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #65   +/-   ##
=========================================
  Coverage     98.37%   98.37%           
  Complexity       47       47           
=========================================
  Files             3        3           
  Lines           123      123           
=========================================
  Hits            121      121           
  Misses            2        2           

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