Prep to release 3.7.0 (#646) #275

Job	Run time
set-image	1s
clippy	1m 36s
bench-rust-nightly (bit-vec)	18m 23s
checks	1m 25s
bench-rust-nightly (bytes)	17m 28s
fmt	1m 13s
miri (bit-vec)	3h 42m 21s
miri (bytes)	3m 35s
tests	3m 49s
miri (generic-array)	3m 27s
bench-rust-nightly (generic-array)	17m 22s
miri (arbitrary)	3m 28s
bench-rust-nightly (derive)	17m 21s
bench-rust-nightly (max-encoded-len)	17m 22s
build-linux-ubuntu-amd64	1m 29s
publish-dry-run	1m 13s
	5h 31m 33s

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