Tests

release: bump starknet to 0.6.0 (and deps) #867

Job	Run time
no-std build	2m 46s
WASM tests	6m 28s
Unix tests (ubuntu-latest, stable)	3m 37s
Unix tests (ubuntu-latest, nightly)	4m 34s
Unix tests (macos-11, stable)	4m 22s
Unix tests (macos-11, nightly)	5m 25s
Windows tests (stable, x86_64-pc-windows-gnu)	9m 44s
Windows tests (stable, x86_64-pc-windows-msvc)	6m 49s
Windows tests (nightly, x86_64-pc-windows-gnu)	8m 27s
Windows tests (nightly, x86_64-pc-windows-msvc)	8m 13s
	1h 0m 25s

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