Update dependency pymdown-extensions to v10.16

| datasource | package            | from  | to    |
| ---------- | ------------------ | ----- | ----- |
| pypi       | pymdown-extensions | 10.15 | 10.16 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docs/requirements.txt

@@ -5,7 +5,7 @@ mkdocs-material==9.6.14
 
 # Markdown extensions
 Pygments==2.19.2
-pymdown-extensions==10.15
+pymdown-extensions==10.16
 
 # MkDocs plugins
 mkdocs-material-extensions==1.3.1