pydantic cleanup

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

kittycad/models/export_file.py

@@ -1,5 +1,5 @@
 
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 
 from .base64data import Base64Data
 
@@ -10,3 +10,5 @@ class ExportFile(BaseModel):
     contents: Base64Data
 
     name: str
+
+    model_config = ConfigDict(protected_namespaces=())