Clean up CI a bit #1261

Job	Run time
Coding Style	12s
Prism	32s
Main Gem Specs \| RuboCop: master \| 2.7	1m 59s
Specs \| 2.7	22s
Specs \| 3.0	9s
Specs \| 3.1	9s
Main Gem Specs \| RuboCop: master \| 3.4	1m 37s
Specs \| 3.2	9s
Main Gem Specs \| RuboCop: v1.61.0 \| 2.7	2m 2s
Specs \| 3.3	15s
Specs \| 3.4	14s
Specs \| head	14s
Coverage \| 2.7	33s
Specs "modern" \| 3.0	10s
Specs \| jruby	36s
Specs \| jruby-head	33s
Specs \| truffleruby	38s
Specs \| truffleruby-head	52s
	11m 16s

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