github: add Ruby 3.3/3.4 for CI

[kenhys]

Let's add Ruby 3.3/3.4 for CI

(check all that apply)

• [-] tests added
• tests passing
  • Needs test: fix hash expression incompatibility for Ruby 3.4 #1055
• [-] README updated (if needed)
• [-] README Table of Contents updated (if needed)
• History.md and version in gemspec are untouched
• backward compatible
• feature works in elasticsearch_dynamic (not required but recommended)

[cosmo0920]

Oh, I found the spinning up candidates of Ruby 3.3 and 3.4 definitions of CI tasks.
Could you rebase off the current master?

[kenhys]

Now rebased.