pydantic cleanup

Signed-off-by: Jess Frazelle <github@jessfraz.com>

kittycad/models/entity_get_num_children.py

@@ -1,5 +1,5 @@
 
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 
 
 
@@ -7,3 +7,5 @@ class EntityGetNumChildren(BaseModel):
     """The response from the `EntityGetNumChildren` command."""
 
     num: int
+
+    model_config = ConfigDict(protected_namespaces=())