Update unit6.ipynb

notebooks/unit6/unit6.ipynb

@@ -248,7 +248,7 @@
     {
       "cell_type": "code",
       "source": [
-        "!pip install git+https://github.com/huggingface/huggingface_sb3@gymnasium-v2 # We didn't merged this branch yet\n",
+        "!pip install huggingface_sb3\n",
         "!pip install huggingface_hub\n",
         "!pip install panda_gym"
       ],
@@ -797,4 +797,4 @@
       }
     }
   ]
-}
+}