chore: release v1.4.0+mc1.21.8 #8

Job	Run time
build-macos	40s
build-linux (aarch64-unknown-linux-musl, linux-aarch64-musl, ubuntu-24.04-arm)	1m 31s
build-windows	2m 11s
build-linux (x86_64-unknown-linux-musl, linux-x86_64-musl, ubuntu-latest)	2m 19s
build-docker (linux/amd64, ubuntu-latest)	3m 9s
build-docker (linux/arm64, ubuntu-24.04-arm)	2m 24s
release	8s
merge-docker	12s
	12m 34s

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