[Admin maintenance] Support new ZeroGPU hardware

Thank you so much for having shared this Space with the community on this demo. We have upgraded the ZeroGPU infra-structure to run on modern blackwell architecture.
For that, we need to upgrade your demo to support that. This PR fixes your demo to work with the new architecture. As this is something we broke on our end, we may merge this PR autonomously. If this breaks unexpectedly or brings unintended consequences, feel free to revert, modify or otherwise. Any issues you can email apolinario@huggingface.co

app.py

@@ -1,3 +1,17 @@
+# ZeroGPU/Blackwell maintenance: restore HfFolder (removed from newer huggingface_hub, still
+# imported by older gradio/oauth.py). Must run before `import spaces` (which imports gradio).
+import huggingface_hub
+if not hasattr(huggingface_hub, "HfFolder"):
+    class HfFolder:
+        @staticmethod
+        def get_token(): return huggingface_hub.get_token()
+        @staticmethod
+        def save_token(token): huggingface_hub.login(token)
+        @staticmethod
+        def delete_token():
+            try: huggingface_hub.logout()
+            except Exception: pass
+    huggingface_hub.HfFolder = HfFolder
 import subprocess  # 🥲
 
 subprocess.run(