chore: update GitHub Actions pins

[akriaueno]

Summary

• update pinned GitHub Actions to their latest semver releases while keeping SHA pinning
• move Rust setup from dtolnay/rust-toolchain to official rustup commands
• update action comments from major-only labels to full semver labels

Testing

• cargo +stable fmt --check
• cargo +stable clippy --all-targets -- -D warnings
• cargo +stable test --locked
• nix run nixpkgs#actionlint -- .github/workflows/ci.yml .github/workflows/release.yml

Notes

• softprops/action-gh-release@v3.0.0 uses Node 24, addressing the Node.js 20 deprecation warning.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b78a7bf4-6672-4ef2-8692-6f840652d3e3

📥 Commits

Reviewing files that changed from the base of the PR and between 5c2409d and 6526111.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-github-actions-pins

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