Replace pydantic_encoder with to_jsonable_python

pydantic_encoder is deprecated in Pydantic v2.

src/quart_schema/extension.py

@@ -11,8 +11,8 @@
 import click
 from humps import camelize
 from pydantic import BaseModel
-from pydantic.json import pydantic_encoder
 from pydantic.json_schema import GenerateJsonSchema
+from pydantic_core import to_jsonable_python
 from quart import current_app, Quart, render_template_string, Response, ResponseReturnValue
 from quart.cli import pass_script_info, ScriptInfo
 from quart.json.provider import DefaultJSONProvider
@@ -114,7 +114,7 @@ def default(object_: Any) -> Any:
         try:
             return super().default(object_)
         except TypeError:
-            return pydantic_encoder(object_)
+            return to_jsonable_python(object_)
 
 
 def hide(func: Callable) -> Callable: