Merge pull request #366 from backstage/renovate/pygments-2.x

chore(deps): update dependency pygments to v2.21.0

Author: awanlin

requirements.txt

@@ -16,7 +16,7 @@ mkdocs-monorepo-plugin==1.1.2
 plantuml-markdown==3.11.2
 mdx_truly_sane_lists==1.3
 pymdown-extensions==11.0.1
-pygments==2.20.0
+pygments==2.21.0
 mkdocs-redirects==1.2.3
 
 # The following are temporary dependencies that are only necessary to work