chore: group dependabot updates and pin actions to commit hashes

[Doarakko]

Summary

Standardize Dependabot grouping rules and pin GitHub Actions to commit hashes.

• Add patch group (update-types: ["patch"]) for non-actions / non-terraform ecosystems so that patch-level updates land in a single PR.
• Group all GitHub Actions into all-actions and Terraform providers into all-providers (where applicable).
• Pin all GitHub Actions referenced in .github/workflows/*.yml to commit hashes using pinact. The version comment after each hash lets Dependabot continue to bump them.

Test plan

• Confirm Dependabot UI accepts the new config (no errors on next scheduled run)
• Confirm existing workflows still pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6dbba4e2-1e15-414a-b6f9-6be82275139c

📥 Commits

Reviewing files that changed from the base of the PR and between 81a52c0 and 3587a01.

📒 Files selected for processing (2)

• .github/dependabot.yml
• .github/workflows/black.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/dependabot-grouping-pinact

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