🎨 Update type annotations in _compat.py

Author: tiangolo

sqlmodel/_compat.py

@@ -103,7 +103,7 @@ def get_model_fields(model: InstanceOrType[BaseModel]) -> Dict[str, "FieldInfo"]
 
     def get_fields_set(
         object: InstanceOrType["SQLModel"]
-    ) -> Union[Set[str], Callable[[BaseModel], set[str]]]:
+    ) -> Union[Set[str], Callable[[BaseModel], Set[str]]]:
         return object.model_fields_set
 
     def set_fields_set(
@@ -398,7 +398,7 @@ def get_model_fields(model: InstanceOrType[BaseModel]) -> Dict[str, "FieldInfo"]
 
     def get_fields_set(
         object: InstanceOrType["SQLModel"]
-    ) -> Union[Set[str], Callable[[BaseModel], set[str]]]:
+    ) -> Union[Set[str], Callable[[BaseModel], Set[str]]]:
         return object.__fields_set__
 
     def set_fields_set(