Make use of sha1 crate an optional feature #1982

Job	Run time
lint	3m 6s
cargo-deny (aarch64-apple-ios)	17s
test (ubuntu-latest, stable)	4m 42s
cargo-deny (aarch64-linux-android)	18s
test (ubuntu-latest, beta)	4m 30s
cargo-deny (i686-pc-windows-gnu)	18s
cargo-deny (i686-pc-windows-msvc)	19s
test (ubuntu-latest, 1.65.0)	6m 2s
cargo-deny (i686-unknown-linux-gnu)	20s
test (macos-latest, stable)	3m 48s
cargo-deny (wasm32-unknown-unknown)	20s
test (macos-latest, beta)	3m 39s
cargo-deny (x86_64-apple-darwin)	21s
test (macos-latest, 1.65.0)	4m 30s
cargo-deny (x86_64-apple-ios)	17s
test (windows-latest, stable)	5m 39s
cargo-deny (x86_64-pc-windows-gnu)	17s
test (windows-latest, beta)	5m 55s
cargo-deny (x86_64-pc-windows-msvc)	17s
test (windows-latest, 1.65.0)	8m 7s
cargo-deny (x86_64-unknown-linux-gnu)	17s
cargo-deny (x86_64-unknown-redox)	18s
	53m 37s

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