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.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dependabot-group-updates

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[Copilot]

Pull request overview

Note

Copilot couldn't run its full agentic review because no GitHub Actions runner was available. Make sure your repository has a runner available to run Copilot's review, or add a copilot-setup-steps.yml file specifying one with the runs-on attribute. See the docs for more details.

Updates Dependabot configuration to reduce PR noise by grouping dependency updates into single PRs per ecosystem (GitHub Actions and Composer), mirroring yiisoft/package-template.

Changes:

• Enable grouped GitHub Actions updates on a weekly schedule.
• Add grouping for Composer dependency updates.
• Introduce ignore rules and a cooldown-like setting (potentially intended to throttle update frequency).

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