Add Ruby 3.4 to CI #1862

Job	Run time
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 32s
specs (ubuntu, 3.1.4)	1m 36s
specs (ubuntu, 3.2.2)	1m 24s
specs (ubuntu, 3.3.0)	1m 24s
specs (ubuntu, 3.4.1)	1m 35s
specs (macos, 3.0.6)	1m 18s
specs (macos, 3.1.4)	1m 28s
specs (macos, 3.2.2)	1m 13s
specs (macos, 3.3.0)	1m 9s
specs (macos, 3.4.1)	1m 16s
specs (windows, 3.0.6)	4m 26s
specs (windows, 3.1.4)	4m 48s
specs (windows, 3.2.2)	4m 47s
specs (windows, 3.3.0)	4m 18s
specs (windows, 3.4.1)	4m 16s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 23s
	38m 24s

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