fixed dependency

vertex_ai_service.py

@@ -198,7 +198,7 @@ if __name__ == '__main__':
     project = "igneous-spanner-441609-h6"
     location = "us-central1"
     model_name = "gemini-1.5-flash"
-    key_path = './secrets/GOOGLE_VERTEX_AI_KEY_SYTOSS-441609.json'
+    key_path = None
     # key_path = './secrets/GOOGLE_VERTEX_AI_KEY_435817.json'
 
     # Initialize the client and generate content