vendor: inhouse crypto_secretbox #76

Job	Run time
build-linux-host-simd	5m 29s
build (aarch64-apple-darwin, macos-latest)	5m 5s
build (x86_64-apple-darwin, macos-latest)	2m 18s
build (aarch64-unknown-linux-gnu, ubuntu-latest)	3m 57s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	1m 58s
release	1s
	18m 48s

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