Bump minitest dependency

[faisal]

Minitest is moving forward. This is the last 5.x version.

Check list:

• Add an entry to the changelog - updated prior line about bumping dependencies
• Squash all commits into a single one
• Describe your PR, link issues, etc.

[faisal]

This is very broken, possibly due to the Minitest update itself.

[etagwerker]

@faisal Looks good, thanks! 👍🏻

[faisal]

I've now squashed this back to one commit again.

Note: Minitest is now on to 6.0. We can update to that once minitest-around works with it or we stop needing minitest-around.

[faisal]

With splattael/minitest-around#40, I hope the next release of minitest-around works with Minitest 6. We're poking at some CI issues on that gem first, though.

[faisal]

CI issues resolved. Waiting on an updated release.

[faisal]

Minitest 6.0 requires Ruby 3.2, so I'll update to that as part of the Ruby 3.2 PR.

Assuming the latest test run is green I think this should be ready to merge.

[faisal]

@etagwerker Did you want to cut one final release to restore Ruby 3.1 compatibility (branching before the 3.1 EOL commit)? If so, do you want to pick this up in the branch? If the answer isn't yes to both of those, I can close this out.

[etagwerker]

@faisal Yes, that sounds like a good idea. 👍🏻