Update dependency markdown to v3.8.1

| datasource | package  | from | to    |
| ---------- | -------- | ---- | ----- |
| pypi       | markdown | 3.8  | 3.8.1 |


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

Author: renovate[bot]

docs/requirements.txt

@@ -1,6 +1,6 @@
 mkdocs==1.6.1
 mike==2.1.3
-markdown==3.8
+markdown==3.8.1
 mkdocs-material==9.6.14
 
 # Markdown extensions