Merge pull request #346 from backstage/renovate/pymdown-extensions-10.x

chore(deps): update dependency pymdown-extensions to v10.21.3

Author: awanlin

requirements.txt

@@ -15,7 +15,7 @@ mkdocs-github-admonitions-plugin==0.1.1
 mkdocs-monorepo-plugin==1.1.2
 plantuml-markdown==3.11.2
 mdx_truly_sane_lists==1.3
-pymdown-extensions==10.21.2
+pymdown-extensions==10.21.3
 pygments==2.20.0
 mkdocs-redirects==1.2.3