node.js deprecation warning

[bsipocz]

I see this warning while using this action. While the fix is easy, it would require a new release, too:

Trigger a ReadTheDocs build
Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: dfm/rtds-action@v1. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

[dfm]

Thanks @bsipocz! It took a little bit to remind myself how all this works, but I've now made a new v1.1.0 release with your PR included. I haven't pointed the v1 tag at it yet since I haven't tested it very well yet, but you can try it out by specifying @v1.1.0 in your workflow. Please let me know if you see any issues and we'll try to get it all sorted!