Fuzz

Bump actions/download-artifact from 3 to 4 #4

Job	Run time
fuzz (bitcoin_deserialize_address)	2m 1s
fuzz (bitcoin_deserialize_amount)	1m 59s
fuzz (bitcoin_deserialize_block)	2m 8s
fuzz (bitcoin_deserialize_prefilled_transaction)	2m 0s
fuzz (bitcoin_deserialize_psbt)	2m 12s
fuzz (bitcoin_deserialize_script)	2m 27s
fuzz (bitcoin_deserialize_transaction)	2m 3s
fuzz (bitcoin_deserialize_witness)	1m 56s
fuzz (bitcoin_deser_net_msg)	2m 0s
fuzz (bitcoin_outpoint_string)	1m 57s
fuzz (bitcoin_script_bytes_to_asm_fmt)	2m 0s
fuzz (hashes_cbor)	2m 4s
fuzz (hashes_json)	2m 6s
fuzz (hashes_ripemd160)	2m 4s
fuzz (hashes_sha1)	2m 1s
fuzz (hashes_sha256)	2m 7s
fuzz (hashes_sha512_256)	2m 2s
fuzz (hashes_sha512)	1m 59s
verify-execution	3s
	37m 9s

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