Make use of sha1 crate an optional feature #1981

Job	Run time
lint	3m 3s
cargo-deny (aarch64-apple-ios)	21s
test (ubuntu-latest, stable)	2m 28s
cargo-deny (aarch64-linux-android)	18s
test (ubuntu-latest, beta)	2m 29s
cargo-deny (i686-pc-windows-gnu)	17s
test (ubuntu-latest, 1.65.0)	2m 30s
cargo-deny (i686-pc-windows-msvc)	18s
test (macos-latest, stable)	2m 32s
cargo-deny (i686-unknown-linux-gnu)	18s
test (macos-latest, beta)	2m 29s
cargo-deny (wasm32-unknown-unknown)	18s
test (macos-latest, 1.65.0)	2m 29s
cargo-deny (x86_64-apple-darwin)	22s
test (windows-latest, stable)	1m 59s
cargo-deny (x86_64-apple-ios)	17s
test (windows-latest, beta)	2m 7s
cargo-deny (x86_64-pc-windows-gnu)	25s
test (windows-latest, 1.65.0)	2m 24s
cargo-deny (x86_64-pc-windows-msvc)	21s
cargo-deny (x86_64-unknown-linux-gnu)	24s
cargo-deny (x86_64-unknown-redox)	18s
	28m 27s

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