Update app.py

to address 401 Client Error: Unauthorized for url: https://huggingface.co/google/paligemma-3b-mix-224/raw/main/config.json

app.py

@@ -13,8 +13,8 @@ subprocess.run(
     shell=True,
 )
 
-hf_token = os.getenv("HF_TOKEN")
-login(token=hf_token, add_to_git_credential=True)
+HF_TOKEN = os.getenv("HF_TOKEN")
+login(token=HF_TOKEN, add_to_git_credential=True)
 
 # Cache for storing loaded models and their summaries
 model_cache = {}