Merge pull request #368 from backstage/renovate/pymdown-extensions-12.x

chore(deps): update dependency pymdown-extensions to v12

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==11.0.2
+pymdown-extensions==12.3
 pygments==2.21.0
 mkdocs-redirects==1.2.3