chore(dependabot): group rumdl action and pre-commit updates and update them only once per month

[sandr01d]

Check list

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have added unit tests for my code
• I have made corresponding changes to the documentation

Description

When I added rumdl, I wasn't aware that they do releases every other day. This creates unnecessary churn. Improve this by:

1. Group the rumdl pre-commit hook and GitHub action together in a single PR
2. Update rumdl only once per month instead of each week

Given that rumdl is only used for checks, I think only updating it once per month is enough. Let me know if you think otherwise.

Type of change

• Bug fix
• New feature
• Refactor
• Breaking change
• Test
• Documentation change
• CI

Summary by CodeRabbit

• Chores
  • Updated dependency management configuration to optimize the scheduling and grouping of routine dependency updates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5c186f39-d07d-4e1a-a507-c0d2701f6e3c

📥 Commits

Reviewing files that changed from the base of the PR and between 6a0130b and 638cde0.

📒 Files selected for processing (1)

• .github/dependabot.yml

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📝 Walkthrough

Walkthrough

Dependabot configuration is updated to create a separate monthly update schedule for *rumdl* dependencies across github-actions and pre-commit ecosystems, with existing weekly update entries adjusted to exclude these dependencies from duplicate processing.

Changes

Dependabot rumdl Group Configuration

Layer / File(s)	Summary
Multi-ecosystem group and targeted updates .github/dependabot.yml	A new multi-ecosystem-groups entry named rumdl with monthly scheduling and chore(deps) commit prefix is defined, followed by new updates entries for github-actions and pre-commit that target *rumdl* dependencies and associate them with this group.
Existing weekly update entries exclusion .github/dependabot.yml	The existing weekly github-actions and pre-commit update entries are updated to ignore *rumdl* dependencies via ignore.dependency-name, ensuring those dependencies are handled only by the new monthly multi-ecosystem group.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• wfxr/forgit#519: Modifies Dependabot configuration for pre-commit ecosystem with commit message prefix behavior changes.
• wfxr/forgit#511: Updates Dependabot to group *rumdl* GitHub Actions and pre-commit dependencies for monthly updates targeting the same rvben/rumdl tooling.

Suggested reviewers

• wfxr
• cjappl
• carlfriedrich

Poem

🐰 Dependabot hops with rumdl pride,
Monthly groups keep chaos nationwide,
No more duplicates, the weekly waves part,
Grouped dependencies, a cleanly-configured heart!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: grouping rumdl updates and scheduling them monthly instead of weekly.
Description check	✅ Passed	The description covers the motivation, proposed changes, and rationale, with checklist items appropriately marked. However, it does not follow the exact template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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