Merge pull request #6459 from enj/enj/i/add_pnbrown_pinniped

Add pnbrown to pinniped-dev

Author: k8s-ci-robot

communication/slack-config/usergroups.yaml

@@ -182,6 +182,7 @@ usergroups:
       - microwavables
       - anjaltelang
       - shamus
+      - pnbrown
 
   - name: steering-members
     long_name: Kubernetes Steering Committee