Release zcash_primitives version 0.20.0 #6069

Job	Run time
Latest build on ubuntu-latest	1m 59s
Latest build on windows-latest	3m 59s
Latest build on macOS-latest	2m 5s
Bitrot check	1m 30s
Build target wasm32-wasi	52s
Clippy (MSRV)	1m 13s
Check ZFuture build on Linux	23s
Test on Linux	6m 38s
Clippy (beta)	12s
Check ZFuture build on macOS	49s
Test Orchard on Linux	8m 37s
Check ZFuture build on Windows	3m 26s
Code coverage	1h 32m 48s
Test NU7 on Linux	6m 57s
Test on macOS	8m 44s
Intra-doc links	2m 6s
Rustfmt	12s
Test Orchard on macOS	11m 18s
Test on Windows	11m 8s
Test Orchard on Windows	14m 52s
protobuf consistency	1m 1s
UUID validity	6s
Test NU7 on Windows	11m 39s
Required status checks have passed	1s
	3h 12m 35s

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