Updates the CI matrix so it includes Ruby 3.2, JRuby 9.3, and JRuby 9.4
Also updates the checkout action version to eliminate the Node 12 warning on builds.
Checklist
[x] I acknowledge that all my contributions will be made under the project's license
[x] I have made a material change to the repo (functionality, testing, spelling, grammar)
Updates the CI matrix so it includes Ruby 3.2, JRuby 9.3, and JRuby 9.4 Also updates the checkout action version to eliminate the Node 12 warning on builds.
Checklist
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