chore: prepare bytes v1.8.0 (#741) #737

Job	Run time
miri	12m 10s
minrust	1m 27s
loom	18s
cross (i686-unknown-linux-gnu)	41s
cross (armv7-unknown-linux-gnueabihf)	33s
nightly	57s
rustfmt	12s
cross (powerpc-unknown-linux-gnu)	34s
cross (powerpc64-unknown-linux-gnu)	38s
stable (ubuntu-latest)	1m 24s
cross (wasm32-unknown-unknown)	15s
tsan	1m 15s
stable (macos-latest)	1m 13s
stable (windows-latest)	2m 19s
Publish Documentation	15s
	24m 11s

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