fix: Respect --locked flag #2857

Job	Run time
test (stable)	6m 29s
test (no rustup)	1m 54s
test (beta)	6m 27s
test (1.26)	9m 15s
test (nightly)	6m 26s
test (1.30)	7m 9s
test (nightly, macos-11)	16m 41s
test (1.31)	7m 52s
test (nightly, windows-2019)	11m 1s
test (1.36)	8m 11s
test (1.39)	8m 19s
msrv / msrv	1m 32s
test (1.41)	8m 11s
deny / deny	18s
miri / miri	49s
tidy / tidy	52s
release-dry-run / prepare	7s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 11s
release-dry-run / build (aarch64-unknown-linux-musl)	51s
release-dry-run / build (aarch64-apple-darwin, macos-11)	1m 46s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	2m 38s
release-dry-run / build (x86_64-unknown-linux-gnu)	48s
release-dry-run / build (x86_64-unknown-linux-musl)	56s
release-dry-run / build (x86_64-apple-darwin, macos-11)	1m 44s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	2m 34s
release-dry-run / build (x86_64-unknown-freebsd)	1m 26s
release-dry-run / build (universal-apple-darwin, macos-11)	2m 8s
	1h 57m 35s

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