Add Ruby 3.3 to CI and bump actions/checkout to v4 #18

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Run time

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Job	Run time
3.0	1m 20s
3.1	1m 17s
3.2	1m 16s
3.3	1m 24s
jruby-9.3	3m 9s
jruby-9.4	3m 11s
	11m 37s