test: fix incorrect test urls with `v0_6` (#687) #707

Job	Run time
Build C++ integration example	1m 8s
Build starknet-curve features	51s
Build starknet-crypto features	1m 28s
Build starknet-core features	1m 44s
Build starknet-providers features	1m 50s
Build starknet-signers features	1m 29s
Build starknet-accounts features	1m 26s
Build starknet-contract features	1m 25s
Build starknet-macros features	1m 25s
Build starknet features	2m 29s
	15m 15s

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