Remove bumping `codecov-action` to v4 #911

Job	Run time
lint	21s
deny (advisories)	56s
deny (bans licenses sources)	51s
build (stable)	2m 37s
clippy (stable)	1m 33s
build (beta)	1m 54s
sort	1m 0s
clippy (beta)	1m 52s
build (nightly-2022-12-13)	2m 21s
build-all-features (stable)	2m 17s
build-all-features (beta)	1m 54s
build-all-features (nightly-2022-12-13)	2m 4s
coverage	4m 9s
doc (stable)	1m 8s
test (stable)	4m 31s
doc (beta)	1m 17s
test (beta)	4m 43s
test (nightly-2022-12-13)	5m 37s
build-no-alloc (thumbv6m-none-eabi)	2m 16s
build-no-alloc (thumbv7m-none-eabi)	2m 11s
build-no-alloc (thumbv8m.main-none-eabi)	2m 27s
build-no-alloc (aarch64-linux-android)	1m 57s
build-no-alloc (aarch64-apple-ios)	1m 54s
build-no-alloc (wasm32-unknown-unknown)	2m 14s
notify	3s
	54m 7s

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