chore: release v0.8.4 (#121) #530

Job	Run time
clippy	47s
spellcheck	7s
cargo-fmt	7s
get_msrv	4s
cargo-doc	2m 41s
coverage	1m 51s
examples	2m 44s
no_features_check	34s
Test msrv on warp-macos-latest-arm64-6x	1m 7s
Test stable on warp-ubuntu-latest-x64-4x	2m 23s
check-windows	2m 16s
Test msrv on warp-ubuntu-latest-x64-4x	1m 41s
Test stable on warp-macos-latest-arm64-6x	3m 21s
	19m 43s

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