Add Ruby 3.4 to CI #1857

Job	Run time
RuboCop	33s
RuboCop	33s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 33s
specs (ubuntu, 3.1.4)	1m 33s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 24s
specs (ubuntu, 3.3.0)	1m 24s
specs (ubuntu, 3.4.1)	1m 5s
specs (ubuntu, 3.4.1)	1m 8s
specs (macos, 3.0.6)	1m 18s
specs (macos, 3.0.6)	1m 18s
specs (macos, 3.1.4)	1m 37s
specs (macos, 3.1.4)	1m 37s
specs (macos, 3.2.2)	1m 21s
specs (macos, 3.2.2)	1m 21s
specs (macos, 3.3.0)	1m 13s
specs (macos, 3.3.0)	1m 13s
specs (macos, 3.4.1)	1m 10s
specs (macos, 3.4.1)	1m 10s
specs (windows, 3.0.6)	3m 20s
specs (windows, 3.0.6)	3m 20s
specs (windows, 3.1.4)	3m 50s
specs (windows, 3.1.4)	3m 50s
specs (windows, 3.2.2)	4m 30s
specs (windows, 3.2.2)	4m 30s
specs (windows, 3.3.0)	3m 27s
specs (windows, 3.3.0)	3m 27s
specs (windows, 3.4.1)	3m 26s
specs (windows, 3.4.1)	3m 26s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 22s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 22s
	1h 8m 9s

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