chore: release 0.8.4 #1176

Job	Run time
doctest	1m 1s
no-std	47s
test stable --no-default-features	1m 17s
test stable	1m 10s
wasm-unknown	1m 6s
test stable --all-features	1m 26s
test nightly --no-default-features	50s
wasm-wasi	1m 6s
clippy	1m 5s
test nightly	44s
test nightly --all-features	1m 7s
docs	24s
test 1.81 --no-default-features	1m 0s
feature-checks	3m 18s
test 1.81	56s
fmt	14s
cfg-check	32s
examples	59s
feature-powerset	5m 2s
	24m 4s

Provide feedback