### Refactors
+* ♻️ Refactor internals, simplify Pydantic v2/v1 utils, `create_model_field`, better types for `lenient_issubclass`. PR [#14860](https://github.com/fastapi/fastapi/pull/14860) by [@tiangolo](https://github.com/tiangolo).
* ♻️ Simplify internals, remove Pydantic v1 only logic, no longer needed. PR [#14857](https://github.com/fastapi/fastapi/pull/14857) by [@tiangolo](https://github.com/tiangolo).
* ♻️ Refactor internals, cleanup unneeded Pydantic v1 specific logic. PR [#14856](https://github.com/fastapi/fastapi/pull/14856) by [@tiangolo](https://github.com/tiangolo).