Updated stylesheets link

Author: MatiasJJ

content/data-visualization.md

@@ -273,7 +273,7 @@ calls.
 - Matplotlib cheatsheets: <https://github.com/matplotlib/cheatsheets>
 - You can also select among pre-defined themes/
   [style
-  sheets](https://matplotlib.org/3.1.1/gallery/style_sheets/style_sheets_reference.html)
+  sheets](https://matplotlib.org/stable/gallery/style_sheets/style_sheets_reference.html)
   with {obj}`~matplotlib.style.use`, for instance:
   ```python
   plt.style.use('ggplot')