Fuzz

Merge ElementsProject/elements-miniscript#52: Update rust-simplicity #37

Job	Run time
fuzz (roundtrip_miniscript_str)	6m 7s
fuzz (roundtrip_miniscript_script)	6m 6s
fuzz (parse_descriptor)	7m 42s
fuzz (roundtrip_semantic)	7m 48s
fuzz (parse_descriptor_secret)	6m 10s
fuzz (roundtrip_descriptor)	6m 11s
fuzz (roundtrip_concrete)	8m 29s
fuzz (compile_descriptor)	6m 13s
fuzz (roundtrip_confidential)	8m 27s
verify-execution	5s
	1h 3m 18s

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