Bump actions/checkout from 6 to 7 (#217) #673

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 truffleruby-head	35s
ubuntu-24.04 2.7	50s
ubuntu-24.04 head	23s
ubuntu-24.04 debug	36s
ubuntu-24.04 3.1	18s
ubuntu-24.04 3.3	14s
ubuntu-24.04 3.0	30s
ubuntu-24.04 3.4	19s
ubuntu-22.04 3.1	16s
ubuntu-22.04 3.3	19s
ubuntu-24.04 4.0	15s
ubuntu-22.04 2.7	42s
ubuntu-22.04 3.0	17s
ubuntu-24.04 jruby-head	1m 4s
ubuntu-22.04 3.2	16s
ubuntu-24.04 3.2	20s
ubuntu-22.04 truffleruby-head	42s
ubuntu-22.04 3.4	19s
ubuntu-22.04 head	25s
ubuntu-22.04 debug	38s
ubuntu-22.04 jruby-head	1m 9s
ubuntu-22.04 4.0	20s
	10m 51s

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