Revert "etcd: Update release-etcd team for release window"

This reverts commit 01b273d.

Author: siyuanfoundation

config/etcd-io/sig-etcd/teams.yaml

@@ -172,7 +172,7 @@ teams:
     description: Granted permission to release etcd-io/etcd
     # The member list is intentionally empty. It should only include the release
     # lead during release windows.
-    members: [siyuanfoundation]
+    members: []
     privacy: closed
     repos:
       etcd: maintain