ci(dependabot): add Dependabot config for github-actions updates

[hummbl-dev]

Summary

Add Dependabot configuration for automated dependency updates.

• github-actions ecosystem: weekly, grouped minor/patch updates

Test plan

• Dependabot creates update PRs within the next week

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 969502cd-ebf8-4aa4-8788-0472b127582b

📥 Commits

Reviewing files that changed from the base of the PR and between 6769ad2 and 69e8d29.

📒 Files selected for processing (1)

• .github/dependabot.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/add-dependabot-config

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