Merge pull request #1662 from zcash/zcash_keys-prepare_no_std #6272

Job	Run time
Bitrot check	1m 36s
Latest build on ubuntu-latest	2m 27s
Latest build on windows-latest	4m 22s
Latest build on macOS-latest	2m 10s
Build target wasm32-wasi	58s
Check ZFuture build on Linux	1m 59s
Clippy (MSRV)	1m 23s
Check ZFuture build on macOS	1m 53s
Check ZFuture build on Windows	4m 5s
Clippy (beta)	15s
Code coverage	1h 37m 53s
Intra-doc links	2m 17s
Test no-Orchard on Linux	5m 6s
Test Orchard on Linux	7m 19s
Test no-Orchard on macOS	7m 31s
Test NU7 on Linux	7m 11s
Test Orchard on macOS	10m 14s
Test no-Orchard on Windows	9m 19s
Test Orchard on Windows	14m 34s
Slow Test Orchard on Linux	5m 29s
Test NU7 on Windows	14m 7s
Slow Test NU7 on Linux	5m 21s
Rustfmt	16s
protobuf consistency	1m 6s
UUID validity	2s
Required status checks have passed	1s
	3h 28m 54s

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