Update rspec Ruby, Gemfile, actions/cache, etc. #975
Merged
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We're moving away from 2.6 and the rspecs tests here don't need to be running 2.6 still, particularly when we still have
brew test-bot
commands being run in the workflow which will be use Homebrew's Ruby. It might also give us an early warning of Ruby 3.1 issues, though the rspec test coverage here is extremely minimal.Also update
actions/cache
to v3 since we support that now in setup-homebrew.