chore: release 0.8.1 #1160

Job	Run time
docs	1m 6s
doctest	43s
cfg-check	52s
clippy	47s
examples	58s
feature-checks	3m 30s
feature-powerset	5m 4s
fmt	14s
no-std	49s
wasm-unknown	1m 7s
test stable --no-default-features	1m 14s
wasm-wasi	1m 5s
test stable	1m 18s
test stable --all-features	1m 44s
test nightly --no-default-features	1m 30s
test nightly	1m 38s
test nightly --all-features	1m 52s
test 1.81 --no-default-features	56s
test 1.81	1m 7s
	27m 34s

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