zebra_script: update to new zcash_script callback API #1492

Job	Run time
Test stable on ubuntu-latest	37m 12s
Check Cargo.lock is up to date	8m 36s
Test beta on ubuntu-latest	37m 25s
Install zebrad from lockfile without cache on ubuntu-latest	8m 28s
Test stable on macos-latest	43m 19s
Check deny.toml bans	26s
Test stable on windows-latest	54m 17s
Check deny.toml bans --features default-release-binaries	28s
Check for unused dependencies	1m 1s
Test beta on windows-latest	53m 41s
Check deny.toml bans --all-features	28s
Check deny.toml sources	29s
Check deny.toml sources --features default-release-binaries	29s
Check deny.toml sources --all-features	27s
Open or update issues for OS integration failures	0s
	4h 6m 46s

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