style(notebooks): remove trailing spaces and update Python kernel info

- Remove trailing whitespace in import statements for better code style adherence.
- Update the Jupyter notebook's kernel specification from 'nams' to 'python3' for clarity.
- Update the Python version in the notebook metadata from 3.8.10 to 3.8.13 to reflect the use of a newer interpreter.

No functional changes are made to the code, ensuring no impact on existing functionality.

notebooks/01-introduction/03-viz.ipynb

@@ -165,7 +165,7 @@
    },
    "outputs": [],
    "source": [
-    "import nxviz as nv \n",
+    "import nxviz as nv\n",
     "from nxviz import annotate\n",
     "\n",
     "\n",
@@ -294,7 +294,7 @@
    "outputs": [],
    "source": [
     "from nxviz import plots\n",
-    "import matplotlib.pyplot as plt \n",
+    "import matplotlib.pyplot as plt\n",
     "\n",
     "nv.hive(G, group_by=\"gender\", node_color_by=\"gender\")\n",
     "annotate.hive_group(G, group_by=\"gender\")"
@@ -355,7 +355,7 @@
   "kernelspec": {
    "display_name": "nams",
    "language": "python",
-   "name": "nams"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
@@ -367,7 +367,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.10"
+   "version": "3.8.13"
   }
  },
  "nbformat": 4,