Add Ruby 3.1 to CI

[andrehjr]

Adding RUby 3.1.0 to the list of supported versions on Github Workflows

[banister]

@andrehjr Thanks! Would you like a commit bit? we need someone to actively maintain this project

[andrehjr]

That would be awesome @banister ! <3

[banister]

@andrehjr done, thanks! 🙇

[banister]

@andrehjr if you share your email address i can also give you gem push rights. Not sure the best way to share email addresses, maybe add it on this thread and then delete it after?

[banister]

@andrehjr thanks, i added you. You can delete that comment now 👍

[andrehjr]

I'll merge this PR 🙌 Thanks again for the trust @banister !

I had to comment ruby-head and jruby-head out, because they are failing (new builds on master will also fail). See this.

Will open new PRs to address those.