chore: prepare bytes v1.6.0 (#681) #587

Job	Run time
rustfmt	13s
nightly	1m 58s
loom	1m 4s
miri	10m 0s
cross (i686-unknown-linux-gnu)	42s
minrust	57s
cross (armv7-unknown-linux-gnueabihf)	36s
stable (ubuntu-latest)	1m 13s
cross (powerpc-unknown-linux-gnu)	34s
stable (macos-latest)	1m 39s
tsan	1m 28s
cross (powerpc64-unknown-linux-gnu)	38s
stable (windows-latest)	2m 6s
cross (wasm32-unknown-unknown)	13s
Publish Documentation	48s
	24m 9s

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