Upgrade to CMake 3.21 #312

Job	Run time
build (14.29, x86-Release, amd64_x86)	1m 15s
build (14.29, x64-Release, amd64)	1m 6s
build (14.29, x64-Debug, amd64)	1m 15s
build (14, x64-Release, amd64)	1m 27s
build (14, x64-Debug, amd64)	49s
build (14, x86-Debug, amd64_x86)	1m 48s
build (14.29, x86-Debug, amd64_x86)	1m 8s
build (14, arm64-Debug, amd64_arm64)	1m 5s
build (14, arm64ec-Debug, amd64_arm64)	46s
build (14, x86-Debug-Clang, amd64_x86)	1m 16s
build (14, x64-Debug-Clang, amd64)	1m 12s
build (14, x64-Release-Win8, amd64)	1m 1s
build (14, x64-Release-Clang, amd64)	1m 23s
build (14, arm64ec-Release, amd64_arm64)	1m 4s
build (14, x64-Debug-Win8, amd64)	59s
build (14, x86-Release, amd64_x86)	1m 24s
build (14, arm64-Release, amd64_arm64)	56s
build (14, arm64-Debug-Clang, amd64_arm64)	1m 22s
build (14, arm64-Release-Clang, amd64_arm64)	2m 34s
build (14, x86-Release-Clang, amd64_x86)	1m 29s
	25m 19s

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