ci: Update dependabot to group updates in single PRs

[holtskinner]

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[gemini-code-assist]

Summary of Changes

Hello @holtskinner, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant improvement to the continuous integration workflow by modifying Dependabot's update strategy. Instead of generating separate pull requests for each individual dependency update, Dependabot will now consolidate multiple updates into a single, grouped pull request. This aims to streamline the dependency management process, reduce PR clutter, and simplify the review and merge process for routine updates.

Highlights

• Dependabot Configuration: Configured Dependabot to group dependency updates into single pull requests for both the pip (implied by uv-dependencies) and GitHub Actions ecosystems. This change consolidates multiple updates, reducing the number of individual PRs.

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[gemini-code-assist]

Code Review

This pull request updates the Dependabot configuration to group dependency updates into single pull requests for both Python packages (managed by uv) and GitHub Actions. This is a great change to reduce the number of pull requests from Dependabot and improve the signal-to-noise ratio. The implementation is correct and follows best practices. I have one minor suggestion to improve the consistency of the group naming.

[gemini-code-assist]

For consistency with the uv-dependencies group name, consider renaming this group to github-actions-dependencies. This makes it clearer that this group is for dependencies and improves readability.

      github-actions-dependencies: