Update maintainer to Anjuan (#55151)

Author: tinabme

ownership.yaml

@@ -9,7 +9,7 @@ ownership:
     description: Please use <https://catalog.githubapp.com/services/docs> instead.
     exec_sponsor: nerdneha
     product_manager: docs-bot
-    maintainer: tinabme
+    maintainer: anjuan
     team_slack: docs
     qos: best_effort
     tier: 2