updates Netlify example (Node v12 no longer required)

[simpixelated]

jakepartusch/wait-for-netlify-action@v1.4 has been updated to support Node v16.

Working example: https://github.com/simpixelated/simpixelated.com/pull/144

Note: Using Node at v12 with the latest updates actually causes this error.

[denar90]

thanks @simpixelated 💪