Bump actions/checkout from 4 to 5 #1398

Job	Run time
Coding Style	36s
Main Gem Specs \| RuboCop: v1.72.1 \| 2.7 \| parser_whitequark	2m 9s
Main Gem Specs \| RuboCop: master \| 3.4 \| parser_whitequark	2m 10s
Main Gem Specs \| RuboCop: master \| 3.4 \| parser_prism	2m 8s
Prism	46s
Main Gem Specs \| RuboCop: master \| 2.7 \| parser_whitequark	2m 23s
Specs \| 3.0	34s
Specs \| 2.7	43s
Specs "modern" \| 3.0	33s
Specs \| jruby	58s
Specs \| 3.2	33s
Specs \| 3.4	35s
Specs \| 3.3	32s
Specs \| truffleruby	57s
Specs \| truffleruby-head	1m 2s
Specs \| 3.1	33s
Specs \| jruby-head	1m 2s
Specs \| head	35s
	18m 49s

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