CI against Ruby 3.4 #1252

Job	Run time
Coding Style \| 3.0	37s
Main Gem Specs \| RuboCop: master \| 2.7	2m 8s
Specs \| 2.7	39s
Prism	22s
Main Gem Specs \| RuboCop: master \| 3.0	1m 50s
Specs \| 3.0	28s
Main Gem Specs \| RuboCop: v1.69.2 \| 3.4	1m 36s
Specs \| 3.1	27s
Specs \| 3.2	29s
Specs \| 3.3	32s
Specs \| 3.4	30s
Specs \| head	26s
Coverage \| 2.7	47s
Specs "modern" \| 3.0	28s
Specs \| jruby	43s
Specs \| jruby-head	45s
Specs \| truffleruby	53s
Specs \| truffleruby-head	1m 5s
	14m 45s

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