Remove sklearn data dtype version fix

Author: SvenKlaassen

doc/examples/py_double_ml_pension.ipynb

@@ -94,23 +94,6 @@
     "data = fetch_401K(return_type='DataFrame')"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "853ba4be",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "# Temporary fix for https://github.com/DoubleML/doubleml-docs/issues/45 / https://github.com/scikit-learn/scikit-learn/issues/21997\n",
-    "# Can be removed when scikit-learn version 1.2.0 is released\n",
-    "dtypes = data.dtypes\n",
-    "dtypes['nifa'] = 'float64'\n",
-    "dtypes['net_tfa'] = 'float64'\n",
-    "dtypes['tw'] = 'float64'\n",
-    "dtypes['inc'] = 'float64'\n",
-    "data = data.astype(dtypes)"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -1179,7 +1162,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.2"
+   "version": "3.12.4"
   },
   "vscode": {
    "interpreter": {