Add IntoIterator for &Vec<> #4193

Job	Run time
build-fuzz	3m 21s
check-git-rev-deps	12s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 0s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	1m 13s
cargo-deny (advisories)	35s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	2m 2s
docs	5m 33s
cargo-deny (bans licenses sources)	36s
fmt	15s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	53s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	53s
publish-dry-run	0s
readme	5m 21s
semver-checks	2m 55s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	1m 40s
complete	1s
	26m 30s

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