[Python] Release 0.41.0

Changed

• Update pyo3 to 0.28.
• Remove unused pythonize dependency.

Performance

• Replace regex-based uri-template format validation with a hand-rolled RFC 6570 parser.
• Specialize items keyword for simple type schemas ({"type": "string"}, {"type": "number"}, etc.) to eliminate dynamic dispatch overhead.
• Precompute regex matches on known properties.
• Faster unevaluatedProperties validation via O(1) property lookup and short-circuit oneOf evaluation.
• Use HashMap for large set of properties.
• Lower HashMap threshold from 40 to 15 properties for faster property lookups.