message: avoid ipv6, see if that makes buildkite happy
diff: @@ -172,7 +172,7 @@ listeners:
  #
  - port: {{SYNAPSE_PORT}}
  tls: false
  - bind_addresses: ['::1', '127.0.0.1']
  + bind_addresses: ['127.0.0.1']
  type: http
  x_forwarded: true
  