Deprecated warnings using turnstyle

[thundering-herd]

Hej, back in 2022, there was a PR merged which introduced NodeJS 16 but I think it was forgotten to update the [action.yml](https://github.com/softprops/turnstyle/blob/ca99add00ff0c9cbc697d22631d2992f377e5bd5/action.yml#L8)

The error show is following:

Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: softprops/turnstyle@ca99add00ff0c9cbc697d22631d2992f377e5bd5. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

Thanks

[jeherve]

This is also tracked in #43.

[chenrui333]

Close as fixed. Thanks!