minor type checking fix

deprogressapi/base.py

@@ -107,7 +107,7 @@ class BaseReport(BaseModel):
         """
         combined_type: Any = cls
         combined_type = cls._combine_subclasses(combined_type)
-        Model: Type[BaseModel] = create_model(
+        Model: Type[BaseReport] = create_model(
             "Report",
             __root__=(combined_type, Field(description="Report type")),
         )