add CodeQL actions group to dependabot configuration

[shogo82148]

Summary by CodeRabbit

• Chores
  • Grouped CodeQL Action dependency updates into a single automated update.

[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: 675b0f4a-7f7e-4a51-b26b-2c0f7ef47378

📥 Commits

Reviewing files that changed from the base of the PR and between e006b3e and df94815.

📒 Files selected for processing (1)

• .github/dependabot.yml

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📝 Walkthrough

Walkthrough

The Dependabot configuration adds a codeql-actions group for all github/codeql-action/* dependencies.

Changes

Dependabot Configuration

Layer / File(s)	Summary
Group CodeQL Action updates .github/dependabot.yml	Dependabot groups all github/codeql-action/* dependencies under codeql-actions.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the added CodeQL actions group in the Dependabot configuration.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch grouping-codeql-action-updates

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