build: bump version to cpp-linter-py/v2.0.0-rc.21 #829

Job	Run time
Pre-seed static binaries' versions / pre-seed-versions	4s
x86_64-unknown-linux-gnu	2m 43s
x86_64-unknown-linux-musl	3m 14s
arm-unknown-linux-gnueabi	3m 1s
aarch64-unknown-linux-musl	3m 1s
aarch64-unknown-linux-gnu	3m 4s
arm-unknown-linux-gnueabihf	3m 7s
powerpc64le-unknown-linux-gnu	3m 1s
powerpc64-unknown-linux-gnu	3m 4s
aarch64-apple-darwin	3m 51s
armv7-unknown-linux-gnueabihf	2m 44s
s390x-unknown-linux-gnu	4m 2s
powerpc-unknown-linux-gnu	2m 56s
x86_64-apple-darwin	2m 50s
aarch64-pc-windows-msvc	5m 31s
x86_64-pc-windows-msvc	5m 45s
publish	0s
	51m 58s

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