📝 Update _is_new_type_instance to handle Python 3.10 compatibility

Author: stickm4n

sqlmodel/_compat.py

@@ -210,7 +210,10 @@ def _is_typing_type_instance(annotation: Any, type_name: str) -> bool:
         return bool(check_type) and isinstance(annotation, tuple(check_type))
 
     def _is_new_type_instance(annotation: Any) -> bool:
-        return _is_typing_type_instance(annotation, "NewType")
+        if sys.version_info >= (3, 10):
+            return _is_typing_type_instance(annotation, "NewType")
+        else:
+            return hasattr(annotation, "__supertype__")
 
     def _is_type_var_instance(annotation: Any) -> bool:
         return _is_typing_type_instance(annotation, "TypeVar")