chore(ci): Add dependabot groups for github-actions updates #9406
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Configures Dependabot to update github-actions dependencies in groups, rather than opening a PR for each dependency. I've set it to do separate PRs for major versions, and a weekly batch PR for non-major versions, but this isn't a strongly-held preference.
https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/optimizing-pr-creation-version-updates
Minor formatting changes by Prettier.