Update docs/notebooks/4_ensembles.ipynb

Co-authored-by: Pascal Bourgault <bourgault.pascal@ouranos.ca>

docs/notebooks/4_ensembles.ipynb

@@ -49,7 +49,7 @@
     "\n",
     "\n",
     "def nimbus():\n",
-    "    repo = \"https://raw.githubusercontent.com/Ouranosinc/xclim-testdata\"\n",
+    "    repo = \"https://raw.githubusercontent.com/Ouranosinc/xclim-testdata/\"\n",
     "    branch = \"v2024.8.23\"\n",
     "    remote = urljoin(urljoin(repo, branch), \"data\")\n",
     "    return pooch.create(\n",