v4.13.0

• Add support for creating validator classes whose metaschema uses a different
  dialect than its schemas. In other words, they may use draft2020-12 to define
  which schemas are valid, but the schemas themselves use draft7 (or a custom
  dialect, etc.) to define which instances are valid. Doing this is likely
  not something most users, even metaschema authors, may need, but occasionally
  will be useful for advanced use cases.

Full Changelog: v4.12.1...v4.13.0