[Rust] Release 0.49.9

Added

• Canonicalization of a oneOf whose branches name object targets a required constant tells apart, which degrades to a union.

Changed

• CanonicalSchema::to_json_schema on a definition emits only the definitions that one names, not the whole document's.

Fixed

• Canonicalization running without end on a conjunction over unions; past a ceiling on the meets it takes, the document stays unmodeled.