Auto Update like Unturned Redist

Examples are here

I don’t think we will add auto-update for new Unity versions.
Unity Engine updates in Unturned are super rare, and this thing is tiny, so no big need.
When Unity updates, usually just a few .dll files change - takes 10 seconds to copy them by hand.
Maybe later add a button in GitHub Actions that does it with one click, but that's it.
Closing the issue for now.