Pacemaker - remove pyiron_gpl from requirements

day_2/03-ace/pacemaker-fit-tutorial.ipynb

@@ -26,15 +26,6 @@
     "from pyiron import Project"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 3,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "import pyiron_gpl"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": 4,