Bump version to 21.2.2 #4288

Job	Run time
cargo-deny (advisories)	40s
check-git-rev-deps	14s
cargo-deny (bans licenses sources)	43s
build-and-test (msrv, 20, ubuntu-latest, wasm32-unknown-unknown, false)	6m 7s
cackle	1m 8s
build-and-test (msrv, 20, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 54s
fmt	16s
build-and-test (msrv, 21, ubuntu-latest, wasm32-unknown-unknown, false)	6m 9s
build-and-test (msrv, 21, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 50s
semver-checks	2m 4s
build-and-test (latest, 20, ubuntu-latest, wasm32-unknown-unknown, false)	5m 52s
build-and-test (latest, 20, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	17m 28s
build-and-test (latest, 21, ubuntu-latest, wasm32-unknown-unknown, false)	5m 52s
build-and-test (latest, 21, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	17m 42s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run / publish-dry-run	45m 28s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu) / publish-dry-run / publish-dry-run	44m 42s
complete	1s
	3h 12m 10s

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