Rust

imp(ics23): fallible conversion for `ProofSpec`, `LeafOp`, `InnerSpec` #2562

Job	Run time
cleanup-runs	6s
clippy_all_features	51s
clippy_no_default_features	51s
nightly_fmt	13s
Check features	0s
doc_all_features	1m 28s
test-msrv (ubuntu-latest, unknown-linux-gnu)	3m 52s
doc_no_default_features	1m 22s
test-msrv (macos-latest, apple-darwin)	9m 31s
test-stable	1m 52s
	20m 6s

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