slack/sig-release: Add Tabby to Security Release Team usergroup

Signed-off-by: Stephen Augustus <foo@auggie.dev>

communication/slack-config/sig-release/usergroups.yaml

@@ -95,7 +95,6 @@ usergroups:
       - sig-release
     members:
       - cjcullen # Product Security Committee
-      - cji # Product Security Committee
       - cpanato # Release Manager
       - feiskyer # Release Manager
       - hasheddan # subproject owner / Release Manager
@@ -107,5 +106,6 @@ usergroups:
       - puerco # Release Manager
       - saschagrunert # subproject owner / Release Manager
       - swamymsft # Product Security Committee
+      - tabbysable # Product Security Committee
       - tallclair # Product Security Committee
       - xmudrii # Release Manager

communication/slack-config/usergroups.yaml

@@ -44,6 +44,9 @@ usergroups:
 
   # Should match the membership of the following teams at all times:
   # - https://git.k8s.io/security/#product-security-committee-psc
+  #
+  # Ensure any changes are also reflected in the Security Release Team
+  # usergroup (within the SIG Release config directory).
   - name: product-security-committee
     long_name: Product Security Committee
     description: |-