Add graph of librustzcash crate dependencies to README.md #6462

Job	Run time
Build target wasm32-wasi	56s
Check ZFuture build on Linux	27s
Test no-Orchard on Linux	4m 35s
Check ZFuture build on macOS	31s
Test no-Orchard on macOS	5m 42s
Test Orchard on Linux	6m 28s
Check ZFuture build on Windows	3m 10s
Test Orchard on macOS	10m 15s
Slow Test Orchard on Linux	4m 18s
Test NU7 on Linux	6m 24s
Test no-Orchard on Windows	9m 43s
Slow Test NU7 on Linux	4m 17s
Test Orchard on Windows	13m 28s
Bitrot check	1m 8s
Test NU7 on Windows	14m 36s
Latest build on ubuntu-latest	54s
Latest build on windows-latest	3m 17s
Build target thumbv7em-none-eabihf	37s
Latest build on macOS-latest	59s
Clippy (MSRV)	1m 19s
Clippy (beta)	15s
Code coverage	1h 15m 27s
Intra-doc links	2m 15s
Rustfmt	14s
protobuf consistency	1m 2s
UUID validity	4s
Required status checks have passed	1s
	2h 52m 22s

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