Add Ruby 3.4 to CI #1858

Job	Run time
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 30s
specs (ubuntu, 3.2.2)	1m 28s
specs (ubuntu, 3.3.0)	1m 26s
specs (ubuntu, 3.4.1)	1m 10s
specs (macos, 3.0.6)	1m 24s
specs (macos, 3.1.4)	1m 21s
specs (macos, 3.2.2)	1m 19s
specs (macos, 3.3.0)	1m 10s
specs (macos, 3.4.1)	1m 24s
specs (windows, 3.0.6)	4m 15s
specs (windows, 3.1.4)	4m 39s
specs (windows, 3.2.2)	4m 37s
specs (windows, 3.3.0)	3m 25s
specs (windows, 3.4.1)	4m 34s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 26s
	37m 8s

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