Add Ruby 3.4 to CI #1859

Job	Run time
RuboCop	30s
RuboCop	30s
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 33s
specs (ubuntu, 3.0.6)	1m 33s
specs (ubuntu, 3.0.6)	1m 31s
specs (ubuntu, 3.1.4)	1m 30s
specs (ubuntu, 3.1.4)	1m 30s
specs (ubuntu, 3.1.4)	1m 30s
specs (ubuntu, 3.2.2)	1m 27s
specs (ubuntu, 3.2.2)	1m 27s
specs (ubuntu, 3.2.2)	1m 26s
specs (ubuntu, 3.3.0)	1m 25s
specs (ubuntu, 3.3.0)	1m 25s
specs (ubuntu, 3.3.0)	1m 24s
specs (ubuntu, 3.4.1)	1m 6s
specs (ubuntu, 3.4.1)	1m 35s
specs (ubuntu, 3.4.1)	1m 11s
specs (macos, 3.0.6)	1m 21s
specs (macos, 3.0.6)	1m 21s
specs (macos, 3.0.6)	1m 21s
specs (macos, 3.1.4)	1m 21s
specs (macos, 3.1.4)	1m 21s
specs (macos, 3.1.4)	1m 25s
specs (macos, 3.2.2)	1m 11s
specs (macos, 3.2.2)	1m 11s
specs (macos, 3.2.2)	1m 13s
specs (macos, 3.3.0)	1m 6s
specs (macos, 3.3.0)	1m 6s
specs (macos, 3.3.0)	1m 10s
specs (macos, 3.4.1)	1m 25s
specs (macos, 3.4.1)	1m 25s
specs (macos, 3.4.1)	1m 38s
specs (windows, 3.0.6)	4m 3s
specs (windows, 3.0.6)	4m 3s
specs (windows, 3.0.6)	4m 3s
specs (windows, 3.1.4)	5m 2s
specs (windows, 3.1.4)	5m 2s
specs (windows, 3.1.4)	4m 49s
specs (windows, 3.2.2)	4m 32s
specs (windows, 3.2.2)	4m 32s
specs (windows, 3.2.2)	5m 2s
specs (windows, 3.3.0)	4m 41s
specs (windows, 3.3.0)	4m 41s
specs (windows, 3.3.0)	4m 29s
specs (windows, 3.4.1)	5m 13s
specs (windows, 3.4.1)	5m 13s
specs (windows, 3.4.1)	4m 28s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 26s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 26s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 24s
	1h 56m 48s

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