Update GitHub Actions

[kaapstorm]

Changes recommended by Claude:

test.yml workflow:

✅ Updated actions/checkout: v3 → v4

• Improved security with Node.js 20 runtime
• Better performance and Git operations
• Eliminated deprecation warnings

✅ Updated actions/setup-python: v4 → v5

• Latest version with improved features
• Added pip caching: cache: 'pip' for faster builds
• Better dependency resolution

✅ Minor cleanup: Fixed YAML formatting in Coveralls step

release_actions.yml workflow:

✅ Updated actions/checkout: v2 → v4 (both jobs)

• Major security improvement: Node.js 12 → Node.js 20
• Much better performance and reliability
• Fixed deprecation warnings

✅ Kept upload-release-assets: Already at latest v3.0

Benefits of These Updates:

1. Security: Eliminated vulnerabilities from old Node.js 12 runtime
2. Performance: Faster checkout and Python setup with caching
3. Reliability: More stable actions with better error handling
4. Maintenance: No more deprecation warnings in CI logs
5. Caching: Automatic pip dependency caching will speed up builds

Caching Benefits:

The new cache: 'pip' setting will automatically cache Python dependencies, which should significantly speed up CI runs.

[mkangia]

I didn't realize I was merging the branch and not approving it.

[mkangia]

Approved!