feat: pin GitHub Actions to SHA digests and add pin-check workflow

[rebEllieous]

What

Pin all GitHub Actions workflows to SHA digests and enforce pinning via CI.
Closes #33
see opendefensecloud/dev-kit#14 for upstream PR of config

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a1436ee3-089d-4791-8e63-55a5aa168d45

📥 Commits

Reviewing files that changed from the base of the PR and between bd4b365 and da83f56.

📒 Files selected for processing (7)

• .github/workflows/conventional-commits.yml
• .github/workflows/golang.yaml
• .github/workflows/issues-add-to-project.yml
• .github/workflows/osv-scanner.yml
• .github/workflows/release-drafter.yaml
• .github/workflows/release.yaml
• .github/workflows/update-action-pins.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/33-pin-gh-actions

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