mangowc: update to 0.12.2 #66962

Job	Run time
Lint templates	36s
Build packages (aarch64, x86_64, glibc, linux/amd64, 0)	2m 34s
Build packages (x86_64, x86_64, glibc, linux/amd64, 1)	3m 7s
Build packages (x86_64-musl, x86_64-musl, musl, linux/amd64, 1)	2m 15s
Build packages (i686, i686, glibc, linux/386, 1)	2m 23s
Build packages (armv6l-musl, x86_64-musl, musl, linux/amd64, 0)	2m 54s
Build packages (armv7l, x86_64, glibc, linux/amd64, 0)	3m 9s
Build packages (aarch64-musl, x86_64-musl, musl, linux/amd64, 0)	3m 36s
	20m 34s

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