Bump actions/checkout from 3 to 4 #2021

Job	Run time
determine-tag	1s
lto (release)	20m 0s
lto (debug)	25m 14s
asan-ubsan (release)	16m 27s
asan-ubsan (debug)	19m 59s
normal (almalinux-8, gcc, release)	41s
normal (almalinux-8, gcc, debug)	35s
normal (almalinux-8, clang, release)	41s
normal (almalinux-8, clang, debug)	40s
normal (almalinux-9, gcc, release)	35s
normal (almalinux-9, gcc, debug)	41s
normal (almalinux-9, clang, release)	38s
normal (almalinux-9, clang, debug)	38s
normal (cross-s390x, gcc, release)	6m 19s
normal (cross-s390x, gcc, debug)	6m 49s
normal (cross-s390x, clang, release)	5m 9s
normal (cross-s390x, clang, debug)	5m 10s
normal (fedora-37, gcc, release)	16m 55s
normal (fedora-37, gcc, debug)	19m 11s
normal (fedora-37, clang, release)	16m 34s
normal (fedora-37, clang, debug)	18m 57s
normal (ubuntu-18.04, gcc, release)	49s
normal (ubuntu-18.04, gcc, debug)	58s
normal (ubuntu-18.04, clang, release)	50s
normal (ubuntu-18.04, clang, debug)	42s
normal (ubuntu-20.04, gcc, release)	38s
normal (ubuntu-20.04, gcc, debug)	52s
normal (ubuntu-20.04, clang, release)	45s
normal (ubuntu-20.04, clang, debug)	39s
normal (ubuntu-22.04, gcc, release)	35s
normal (ubuntu-22.04, gcc, debug)	40s
normal (ubuntu-22.04, clang, release)	37s
normal (ubuntu-22.04, clang, debug)	43s
	3h 10m 42s

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