[ticket/17176] Use Symfony name for event dispatcher

The previously used override of the names is no longer supported.

PHPBB3-17176

phpBB/config/default/container/services_auth.yml

@@ -52,7 +52,7 @@ services:
             - '@config'
             - '@dbal.conn'
             - '@auth.provider.db'
-            - '@dispatcher'
+            - '@event_dispatcher'
             - '@language'
             - '@request'
             - '@auth.provider.oauth.service_collection'