blanket: update to 0.8.0, adopt #67215

Job	Run time
Lint templates	50s
Build packages (aarch64, x86_64, glibc, linux/amd64, 0)	6m 35s
Build packages (aarch64-musl, x86_64-musl, musl, linux/amd64, 0)	5m 45s
Build packages (x86_64-musl, x86_64-musl, musl, linux/amd64, 1)	3m 54s
Build packages (i686, i686, glibc, linux/386, 1)	3m 51s
Build packages (armv6l-musl, x86_64-musl, musl, linux/amd64, 0)	5m 43s
Build packages (armv7l, x86_64, glibc, linux/amd64, 0)	5m 30s
Build packages (x86_64, x86_64, glibc, linux/amd64, 1)	5m 4s
	37m 12s

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