chore(deps): update dependency markdown to v3.8.1 (argoproj#23480)

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

Author: renovate[bot]

docs/requirements.txt

@@ -5,5 +5,5 @@ mkdocs-material==7.1.8
 markdown_include==0.8.1
 pygments==2.19.1
 jinja2==3.1.6
-markdown==3.8
+markdown==3.8.1
 pymdown-extensions==10.15