build: bump version to cpp-linter/v2.0.0-rc.21 #812

Job	Run time
Pre-seed static binaries' versions / pre-seed-versions	4s
aarch64-unknown-linux-musl	3m 6s
arm-unknown-linux-gnueabihf	2m 56s
x86_64-unknown-linux-gnu	2m 46s
armv7-unknown-linux-gnueabihf	3m 0s
x86_64-unknown-linux-musl	3m 9s
aarch64-unknown-linux-gnu	3m 2s
arm-unknown-linux-gnueabi	3m 1s
powerpc64-unknown-linux-gnu	3m 7s
powerpc-unknown-linux-gnu	2m 58s
x86_64-pc-windows-msvc	5m 21s
aarch64-pc-windows-msvc	5m 49s
s390x-unknown-linux-gnu	12m 44s
x86_64-apple-darwin	3m 8s
powerpc64le-unknown-linux-gnu	3m 2s
aarch64-apple-darwin	3m 7s
publish	-1s
	1h 0m 19s

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