Add Ruby-3.4 support (#808) #309

Job	Run time
lint	16s
test (ruby-3.4, ubuntu-latest)	52s
test (ruby-3.2, ubuntu-latest)	23s
test-flaky (jruby-9.4, ubuntu-latest)	30s
test (ruby-3.0, ubuntu-latest)	31s
test (ruby-3.1, ubuntu-latest)	24s
test (ruby-3.3, ubuntu-latest)	28s
	3m 24s

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