Favor vec![] over Vec::new #2269

Job	Run time
miri	1m 33s
test (stable)	1m 44s
test (beta)	1m 51s
test (nightly)	1m 23s
test (nightly, macos-11)	6m 45s
test (nightly, windows-2019)	5m 50s
deny / deny	18s
release-dry-run / prepare	3s
msrv / msrv	6m 42s
tidy / tidy	59s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 31s
release-dry-run / build (aarch64-unknown-linux-musl)	1m 24s
release-dry-run / build (aarch64-apple-darwin, macos-11)	2m 18s
release-dry-run / build (x86_64-unknown-linux-gnu)	1m 21s
release-dry-run / build (x86_64-unknown-linux-musl)	1m 7s
release-dry-run / build (x86_64-apple-darwin, macos-11)	2m 23s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	3m 18s
release-dry-run / build (universal-apple-darwin, macos-11)	3m 3s
	43m 33s

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