Prep to release 3.7.1 #231

Job	Run time
set-image	1s
clippy	1m 23s
checks	1m 27s
bench-rust-nightly (bit-vec)	6m 56s
fmt	53s
bench-rust-nightly (bytes)	6m 56s
bench-rust-nightly (generic-array)	6m 55s
miri (bit-vec)	7m 0s
tests	3m 23s
bench-rust-nightly (derive)	6m 56s
miri (bytes)	3m 3s
bench-rust-nightly (max-encoded-len)	6m 56s
miri (generic-array)	3m 2s
miri (arbitrary)	3m 11s
build-linux-ubuntu-amd64	1m 11s
publish-dry-run	1m 3s
	1h 0m 16s

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