Fix minimum MAC size this fixes a deserialization error #21

Job	Run time
Check unused dependencies	1m 24s
Validate configs	1m 7s
Audit dependencies	36s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 31s
Clippy (x86_64-unknown-linux-gnu, false, true)	1m 13s
Format	7s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 30s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	42s
Smoke-test fuzzing targets	5m 0s
Build and test (1.66.0, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 2s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	46s
Smoke-test fuzzing targets (--features ntpv5)	2m 41s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	3m 4s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	37s
Validate man pages	8s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 49s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	2m 37s
Build and test (1.66.0, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-gnu)	2m 0s
Build and test (stable, ubuntu-latest, --features ntpv5, x86_64-unknown-linux-musl)	2m 27s
Build and test (stable, macos-latest, --features ntpv5, x86_64-apple-darwin)	2m 1s
	34m 22s

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