Bump actions/checkout from 3 to 4 #864

Job	Run time
openssl-1.0.2u	2m 54s
openssl-1.1.0l	2m 9s
openssl-1.1.1v	2m 22s
openssl-3.0.10	4m 25s
openssl-3.1.2	4m 13s
libressl-3.1.5	2m 59s
libressl-3.2.7	3m 43s
libressl-3.3.6	3m 18s
libressl-3.4.3	3m 33s
libressl-3.5.3	3m 7s
libressl-3.6.3	3m 2s
libressl-3.7.3	3m 17s
libressl-3.8.0	3m 10s
openssl-3.0.10 fips	4m 5s
openssl-3.1.2 fips	4m 42s
openssl-head	6m 35s
openssl-head fips	5m 12s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	1m 10s
ubuntu-22.04 3.0	1m 3s
ubuntu-22.04 3.1	1m 14s
ubuntu-22.04 3.2	1m 28s
ubuntu-22.04 head	3m 56s
ubuntu-22.04 truffleruby	1m 59s
ubuntu-22.04 truffleruby-head	4m 14s
ubuntu-20.04 2.7	1m 11s
ubuntu-20.04 3.0	1m 5s
ubuntu-20.04 3.1	1m 23s
ubuntu-20.04 3.2	1m 24s
ubuntu-20.04 head	1m 1s
ubuntu-20.04 truffleruby-head	1m 42s
macos-latest 2.7	1m 47s
macos-latest 3.0	1m 23s
macos-latest 3.1	1m 34s
macos-latest 3.2	1m 46s
macos-latest head	2m 10s
macos-latest truffleruby-head	4m 21s
windows-latest 2.7	6m 18s
windows-latest 3.0	6m 54s
windows-latest 3.1	6m 58s
windows-latest 3.2	5m 28s
windows-latest ucrt	5m 47s
windows-latest mswin	4m 1s
	2h 14m 5s

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