Use zcash_script’s new `Script` trait #1962

Job	Run time
Check deny.toml bans	33s
Check Cargo.lock is up to date	8m 41s
Check deny.toml bans --features default-release-binaries	35s
Install zebrad from lockfile without cache on ubuntu-latest	8m 44s
Check deny.toml bans --all-features	30s
Check deny.toml sources	31s
Test stable on ubuntu-latest	39m 17s
Check deny.toml sources --features default-release-binaries	36s
Check deny.toml sources --all-features	30s
Check for unused dependencies	1m 3s
Test beta on ubuntu-latest	40m 15s
Test stable on macos-latest	43m 27s
Test stable on windows-latest	1h 2m 48s
Test beta on windows-latest	59m 41s
Open or update issues for OS integration failures	0s
	4h 27m 11s

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