feat(api): downgrade metadata parse warnings to debug

I set these to warn during testing and neglected to undo the change.

invokeai/app/api/routers/images.py

@@ -69,23 +69,23 @@ async def upload_image(
     if isinstance(metadata_raw, str):
         _metadata = metadata_raw
     else:
-        ApiDependencies.invoker.services.logger.warn("Failed to parse metadata for uploaded image")
+        ApiDependencies.invoker.services.logger.debug("Failed to parse metadata for uploaded image")
         pass
 
     # attempt to parse workflow from image
     workflow_raw = pil_image.info.get("invokeai_workflow", None)
     if isinstance(workflow_raw, str):
         _workflow = workflow_raw
     else:
-        ApiDependencies.invoker.services.logger.warn("Failed to parse workflow for uploaded image")
+        ApiDependencies.invoker.services.logger.debug("Failed to parse workflow for uploaded image")
         pass
 
     # attempt to extract graph from image
     graph_raw = pil_image.info.get("invokeai_graph", None)
     if isinstance(graph_raw, str):
         _graph = graph_raw
     else:
-        ApiDependencies.invoker.services.logger.warn("Failed to parse graph for uploaded image")
+        ApiDependencies.invoker.services.logger.debug("Failed to parse graph for uploaded image")
         pass
 
     try: