Update to the latest version of bundler

[jcoyne]

Why and what is being done.
This prevents the deprecation warning:

Calling DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call DidYouMean.correct_error(error_name, spell_checker)' instead.

Pre-Merge Checklist

• CHANGELOG.md updated with short summary

[grosser]

yeah that warning is annoying :D

[grosser]

needs rebase ... maybe just don't change changelog for this
... PR template can say "... for user facing changes" to be clearer

[jcoyne]

Rebased and PR template updated.

[grosser]

2.7 failed ... should be fine to drop it from the matrix and then bump the min ruby version in .rubocop.yml (careful with all the new auto-formattings)

ERROR:  Error installing bundler:
  	There are no versions of bundler (= 2.5.5) compatible with your Ruby & RubyGems
  	bundler requires Ruby version >= 3.0.0. The current ruby version is 2.7.8.[22](https://github.com/ambethia/recaptcha/actions/runs/7643419720/job/20825379372?pr=443#step:3:27)5.

[jcoyne]

I made #444 to add 3.3 and drop 2.7. After that is merged, I can rebase this.

[jcoyne]

Okay, this is looking good now.