Configure Dependabot to batch GitHub Actions updates

[Copilot]

Template B: This PR does not modify behaviour or interface

E.g. the PR only touches documentation or tests, does refactorings, etc.

Include the following checklist in your PR:

• Patches conform to the coding conventions.
• Is this a PR that fixes CI? If so, it will need to be backported to older cabal release branches (ask maintainers for directions).

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Dependabot currently creates separate PRs for each GitHub Actions update. This adds a groups configuration to batch all action updates into a single PR.

Changes:

• Added groups section to .github/dependabot.yml for the github-actions ecosystem
• Pattern * matches all actions, consolidating updates into one PR named "Bump the github-actions group with N updates"

  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"
    groups:
      github-actions:
        patterns:
          - "*"

Original prompt

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This section details on the original issue you should resolve

<issue_title>Dependabot should batch updates to the github-actions ecosystem in a single PR</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Dependabot should batch updates to the github-actions ecosystem in a single PR #11357

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[ulysses4ever]

This aligns with what I saw on the internets. Thanks @copilot!

[geekosaur]

Whoops, missed that Artem doesn't count since he worked with Copilot.

[ulysses4ever]

yeah, this was new to me. @Mikolaj maybe? Your approval will save thousands of approvals for future dependabot PRs that won't happen because of the batching!

[Mikolaj]

Woot!