bump `starknet-types-core` to 0.1.6 #650

Job	Run time
Build C++ integration example	1m 0s
Build starknet-curve features	17s
Build starknet-crypto features	40s
Build starknet-core features	1m 4s
Build starknet-providers features	1m 12s
Build starknet-signers features	1m 2s
Build starknet-accounts features	51s
Build starknet-contract features	51s
Build starknet-macros features	36s
Build starknet features	1m 56s
	9m 29s

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