refactor: use `deserialize_str` instead (#527) #280

Job	Run time
Build starknet-ff features	41s
Build starknet-curve features	16s
Build starknet-crypto-codegen features	15s
Build starknet-crypto features	33s
Build starknet-core features	1m 7s
Build starknet-providers features	1m 7s
Build starknet-signers features	46s
Build starknet-accounts features	54s
Build starknet-contract features	55s
Build starknet-macros features	31s
Build starknet features	1m 31s
	8m 36s

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