CI against an older RuboCop version #1258

Job	Run time
Coding Style \| 3.0	33s
Main Gem Specs \| RuboCop: master \| 2.7	2m 6s
Prism	22s
Main Gem Specs \| RuboCop: master \| 3.4	1m 42s
Specs \| 2.7	37s
Main Gem Specs \| RuboCop: v1.61.0 \| 2.7	2m 7s
Specs \| 3.0	34s
Specs \| 3.1	30s
Specs \| 3.2	36s
Specs \| 3.3	34s
Specs \| 3.4	30s
Specs \| head	35s
Coverage \| 2.7	44s
Specs "modern" \| 3.0	29s
Specs \| jruby	50s
Specs \| jruby-head	49s
Specs \| truffleruby	57s
Specs \| truffleruby-head	1m 5s
	15m 40s

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