slack/usergroups: Alpha-sort Tabby in product-security-committee

Signed-off-by: Stephen Augustus <[email protected]>

Author: justaugustus

communication/slack-config/usergroups.yaml

@@ -58,8 +58,8 @@ usergroups:
       - lukehinds
       - micahhausler
       - swamymsft
-      - tallclair
       - tabbysable
+      - tallclair
 
   - name: velero-maintainers
     long_name: Velero Maintainers