v0.8: Prepare for the next release #2812

Job	Run time
test (1.61, ubuntu-latest)	6m 23s
features (msrv)	1m 37s
test (1.61, windows-latest)	8m 15s
careful	4m 54s
test (stable, ubuntu-latest)	4m 56s
features (nightly)	31s
codegen	27s
test (stable, windows-latest)	6m 53s
test (nightly, ubuntu-latest)	8m 24s
dependencies	18s
test (nightly, windows-latest)	12m 40s
miri	21m 7s
rustfmt	6s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	4m 57s
test (nightly, ubuntu-latest, aarch64-unknown-linux-gnu)	8m 38s
docs	10s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	7m 54s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	8m 45s
loom	47s
san	12m 19s
shellcheck	22s
ci	0s
	2h 0m 23s

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