fix: optional params in file upload API (#237)

---------
Co-authored-by: Marcus Schiesser <mail@marcusschiesser.de>

.changeset/five-maps-arrive.md

+---
+"create-llama": patch
+---
+
+Fix: private file upload not working in Python without LlamaCloud

templates/types/streaming/fastapi/app/api/routers/upload.py

@@ -14,7 +14,7 @@ logger = logging.getLogger("uvicorn")
 class FileUploadRequest(BaseModel):
     base64: str
     filename: str
-    params: Any
+    params: Any = None
 
 
 @r.post("")