fix request level checksum #3070

Job	Run time
clang-sanitizers (,thread)	17m 6s
linux-compat (manylinux1-x64)	15m 39s
clang-sanitizers (,address,undefined)	15m 56s
linux-shared-libs	15m 38s
linux-compat (manylinux1-x86)	16m 18s
linux-compat (manylinux2014-x64)	15m 56s
byo-crypto	2m 30s
linux-compat (manylinux2014-x86)	16m 19s
linux-compat (al2-x64)	14m 53s
linux-compiler-compat (clang-3)	15m 31s
windows	15m 46s
linux-compiler-compat (clang-6)	16m 4s
windows-vc14 (x86)	16m 41s
linux-compiler-compat (clang-8)	16m 25s
windows-vc14 (x64)	15m 9s
linux-compiler-compat (clang-9)	16m 50s
osx	15m 44s
linux-compiler-compat (clang-10)	17m 6s
linux-compiler-compat (clang-11)	17m 9s
linux-compiler-compat (gcc-4.8)	15m 55s
windows-app-verifier	28m 45s
linux-compiler-compat (gcc-5)	16m 8s
windows-shared-libs	17m 42s
linux-compiler-compat (gcc-6)	16m 32s
linux-compiler-compat (gcc-7)	14m 58s
linux-compiler-compat (gcc-8)	15m 39s
downstream	15m 18s
linux-debug	15m 33s
	7h 29m 10s

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