Add Ruby 3.4 to CI #1873

Job	Run time
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 33s
specs (ubuntu, 3.1.4)	1m 31s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 25s
specs (ubuntu, 3.4.1)	1m 33s
specs (macos, 3.0.6)	1m 45s
specs (macos, 3.1.4)	1m 56s
specs (macos, 3.2.2)	1m 19s
specs (macos, 3.3.0)	1m 17s
specs (macos, 3.4.1)	1m 41s
specs (windows, 3.0.6)	3m 36s
specs (windows, 3.1.4)	4m 7s
specs (windows, 3.2.2)	4m 50s
specs (windows, 3.3.0)	4m 7s
specs (windows, 3.4.1)	4m 16s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 25s
	38m 17s

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