CI against Ruby 3.4 #1248

Job	Run time
Prism	26s
Coding Style \| 3.0	35s
Main Gem Specs \| RuboCop: master \| 2.7	2m 6s
Specs \| 2.7	39s
Main Gem Specs \| RuboCop: master \| 3.0	1m 45s
Specs \| 3.0	27s
Main Gem Specs \| RuboCop: v1.61.0 \| 3.4	1m 53s
Specs \| 3.1	30s
Specs \| 3.2	29s
Specs \| 3.3	27s
Specs \| 3.4	31s
Specs \| head	28s
Coverage \| 2.7	41s
Specs "modern" \| 3.0	27s
Specs \| jruby	42s
Specs \| jruby-head	49s
Specs \| truffleruby	55s
Specs \| truffleruby-head	1m 1s
	14m 51s

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