Deprecation of actions/setup-ruby

[AlenaSviridenko]

We are now safe to deprecate actions/setup-ruby after GitHub-hosted runners were moved to official pre-cached binaries.
We encourage customers to move to ruby/setup-ruby actions.

[eregon]

dist/index.js should also be updated

[AlenaSviridenko]

Thank you, updated

[AlenaSviridenko]

Checks are weirdly failed, the same matrix ran successfully from my fork in my test repository https://github.com/AlenaSviridenko/flutter_test_app/runs/1822884736?check_suite_focus=true

[nirvdrum]

Thank you for adding contextual information to the messages here. I think given the large number of people using this action, such messages will make it easy for them to migrate to a suitable replacement.

Some of the messaging sounded a bit off to me, as a native speaker of American English. I've made some suggestions on how to make it sound more natural. I was hesitant to comment given how contentious grammar changes can be. If you're put off by grammar suggestions, I'm truly sorry and please feel free to ignore.

[AlenaSviridenko]

@nirvdrum, thank you for your review! Actually, as a non-native speaker, I was eagerly waiting for grammar review to make this deprecation note smooth and natural. I re-phrased a bit some of your suggestions, please, have a look.

[eregon]

Checks are weirdly failed, the same matrix ran successfully from my fork in my test repository https://github.com/AlenaSviridenko/flutter_test_app/runs/1822884736?check_suite_focus=true

It looks like Ruby 2.4 is not in the toolcache for Ubuntu 20.04:
https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-README.md#ruby
And it's documented to still be for Ubuntu 18.04:
https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu1804-README.md#ruby
The run here was on 20.04 and the one in the fork on 18.04, so this is a side effect of ubuntu-latest being changed to point to 20.04
Ruby 2.4 is EOL, so it kind of makes sense: https://www.ruby-lang.org/en/news/2020/04/05/support-of-ruby-2-4-has-ended/

I'd suggest dropping 2.4 from the test matrix.

[AlenaSviridenko]

Matrix was fixed, now all checks are green.