chore: use `coins-ledger` from crates.io #624

Job	Run time
Build C++ integration example	1m 5s
Build starknet-curve features	23s
Build starknet-crypto features	40s
Build starknet-core features	1m 11s
Build starknet-providers features	1m 20s
Build starknet-signers features	1m 2s
Build starknet-accounts features	1m 2s
Build starknet-contract features	56s
Build starknet-macros features	37s
Build starknet features	1m 48s
	10m 4s

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