chore: release `v1.0.0-rc.4` #3784

Job	Run time
check-toml	35s
docs	1m 12s
check-all-features / check-all-features	3m 47s
check and test / ubuntu-latest, stable	2m 57s
clippy / ubuntu-latest, stable	2m 9s
format / ubuntu-latest, nightly	49s
integration tests / ubuntu-latest, stable	3m 3s
	14m 32s

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