Bump actions/checkout from 3 to 4 #537

Job	Run time
asan-ubsan (release)	1s
asan-ubsan (debug)	4s
lto (release)	1s
lto (debug)	1s
normal (almalinux-8, gcc, release)	2s
normal (almalinux-8, gcc, debug)	3s
normal (almalinux-8, clang, release)	1s
normal (almalinux-8, clang, debug)	2s
normal (almalinux-9, gcc, release)	1s
normal (almalinux-9, gcc, debug)	3s
normal (almalinux-9, clang, release)	2s
normal (almalinux-9, clang, debug)	2s
normal (cross-s390x, gcc, release)	1s
normal (cross-s390x, gcc, debug)	1s
normal (cross-s390x, clang, release)	2s
normal (cross-s390x, clang, debug)	3s
normal (fedora-37, gcc, release)	1s
normal (fedora-37, gcc, debug)	1s
normal (fedora-37, clang, release)	1s
normal (fedora-37, clang, debug)	1s
normal (ubuntu-18.04, gcc, release)	1s
normal (ubuntu-18.04, gcc, debug)	1s
normal (ubuntu-18.04, clang, release)	1s
normal (ubuntu-18.04, clang, debug)	1s
normal (ubuntu-20.04, gcc, release)	1s
normal (ubuntu-20.04, gcc, debug)	1s
normal (ubuntu-20.04, clang, release)	1s
normal (ubuntu-20.04, clang, debug)	2s
normal (ubuntu-22.04, gcc, release)	2s
normal (ubuntu-22.04, gcc, debug)	1s
normal (ubuntu-22.04, clang, release)	3s
normal (ubuntu-22.04, clang, debug)	2s
	51s

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