Update CMake version requirements to 3.9 #3694

Job	Run time
linux-compiler-compat (clang-3)	16m 35s
clang-sanitizers (,thread)	18m 1s
linux-compiler-compat (clang-6)	17m 46s
clang-sanitizers (,address,undefined)	17m 7s
linux-compiler-compat (clang-8)	18m 22s
linux-compiler-compat (clang-9)	18m 2s
linux-compiler-compat (clang-10)	16m 46s
byo-crypto	3m 4s
linux-shared-libs	16m 50s
linux-compiler-compat (clang-11)	17m 29s
linux-compat (manylinux1-x64)	17m 7s
linux-compiler-compat (gcc-4.8)	15m 35s
linux-compat (manylinux1-x86)	17m 20s
linux-compiler-compat (gcc-5)	15m 56s
windows	16m 44s
windows-vc14 (x86)	18m 30s
linux-compiler-compat (gcc-6)	16m 35s
linux-compat (manylinux2014-x64)	16m 17s
windows-vc14 (x64)	17m 13s
linux-compiler-compat (gcc-7)	17m 7s
linux-compiler-compat (gcc-8)	17m 32s
linux-compat (manylinux2014-x86)	16m 59s
linux-compat (al2-x64)	15m 0s
downstream	16m 19s
linux-debug	16m 35s
macos	16m 32s
macos-x64	15m 42s
windows-app-verifier	12m 29s
windows-shared-libs	17m 25s
	7h 52m 59s

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