Fuzz

Merge rust-bitcoin/rust-miniscript#630: fix: needless borrow (referen… #283

Job	Run time
fuzz (roundtrip_semantic)	3m 16s
fuzz (parse_descriptor)	3m 22s
fuzz (parse_descriptor_secret)	3m 19s
fuzz (roundtrip_miniscript_script)	3m 26s
fuzz (roundtrip_miniscript_str)	3m 31s
fuzz (roundtrip_descriptor)	3m 23s
fuzz (roundtrip_concrete)	3m 24s
fuzz (compile_descriptor)	3m 30s
verify-execution	12s
	27m 23s

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