Bump actions/checkout from 4 to 5 (#140) #482

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 2.7	43s
ubuntu-24.04 3.0	19s
ubuntu-24.04 3.1	13s
ubuntu-24.04 3.2	23s
ubuntu-24.04 3.3	22s
ubuntu-24.04 3.4	22s
ubuntu-24.04 truffleruby-head	25s
ubuntu-22.04 3.1	30s
ubuntu-24.04 debug	37s
ubuntu-24.04 jruby-head	1m 1s
ubuntu-22.04 3.0	11s
ubuntu-22.04 2.7	43s
ubuntu-22.04 3.2	20s
ubuntu-22.04 3.3	14s
ubuntu-22.04 3.4	16s
ubuntu-22.04 truffleruby-head	22s
ubuntu-22.04 head	21s
ubuntu-24.04 head	25s
ubuntu-22.04 jruby-head	1m 12s
ubuntu-22.04 debug	35s
	9m 38s

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