Prep to release 3.7.1 #234

Job	Run time
set-image	1s
tests	3m 39s
checks	1m 19s
clippy	1m 25s
fmt	53s
miri (bit-vec)	5h 44m 54s
bench-rust-nightly (bit-vec)	17m 49s
miri (bytes)	3m 22s
bench-rust-nightly (bytes)	16m 53s
miri (generic-array)	3m 12s
bench-rust-nightly (generic-array)	17m 1s
miri (arbitrary)	3m 2s
bench-rust-nightly (derive)	16m 47s
bench-rust-nightly (max-encoded-len)	16m 54s
build-linux-ubuntu-amd64	1m 12s
publish-dry-run	1m 4s
	7h 29m 27s

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