bump actions/{ccache,checkout} to v4 #1979

Job	Run time
macos-latest: clang++ Release Threads	12m 19s
macos-latest: clang++ Release OneTBB	1m 21s
macos-latest: clang++ Release PaRSEC	1m 27s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	35m 56s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	1m 49s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	2m 0s
macos-latest: clang++ Debug Threads	20m 20s
macos-latest: clang++ Debug OneTBB	1m 33s
macos-latest: clang++ Debug PaRSEC	1m 33s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 29s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 37s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 43s
	2h 10m 7s

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