director: resolve transformers5 + hub1 in one pip pass

kaggle/notebook_director.py

@@ -15,8 +15,10 @@ def sh(cmd: str) -> None:
 
 
 def main() -> None:
-    sh("pip install -q huggingface_hub")
-    sh("pip install -q --upgrade 'transformers>=5' accelerate")
+    # One resolver pass: transformers 5 expects a newer huggingface_hub than the
+    # image ships, and installing them separately leaves `httpx` missing from
+    # huggingface_hub.utils.
+    sh("pip install -q --upgrade 'transformers>=5' 'huggingface_hub>=1.0' accelerate")
 
     import transformers
     print("transformers", transformers.__version__, flush=True)