Fix two Ruby 2.2 issues, add to Actions & remove from Travis [changelog skip]

[MSP-Greg]

Description

Note that Ruby 2.2 needs a RubyGems update to pass.

Closes #2145

Your checklist for this pull request

• I have reviewed the guidelines for contributing to this repository.
• I have added an entry to History.md if this PR fixes a bug or adds a feature. If it doesn't need an entry to HISTORY.md, I have added [changelog skip] the pull request title.
• I have added appropriate tests if this PR fixes a bug or adds a feature.
• My pull request is 100 lines added/removed or less so that it can be easily reviewed.
• If this PR doesn't need tests (docs change), I added [ci skip] to the title of the PR.
• If this closes any issues, I have added "Closes #issue" to the PR description or my commit messages.
• I have updated the documentation accordingly.
• All new and existing tests passed, including Rubocop.

[MSP-Greg]

1. It's time to skip OpenSSL 1.0.1 CI. Travis Ruby 2.2 uses OpenSSL 1.0.1f, dated 6 Jan 2014. Just no...

2. The PR added to two <io>.closed? checks, I didn't do so conditionally based on the Ruby version. Ok, or change?

[nateberkopec]

Those are fine. A conditional would be overkill here IMO.

[MSP-Greg]

@nateberkopec

I saw the failure on the commit of this, and in my fork ran CI with the seed value (--seed 21956).

Not pretty. Every single Ubuntu & macOS job failed. I assume it's an unstable test(s) with UNIXSocket or fork (maybe a Signal also), because all the Windows jobs passed.

CI is at:
https://github.com/MSP-Greg/puma/actions/runs/49629001