Change stroom ver to 7.5.5

Author: at055612

Diff for: bin/stack/container_versions.env

@@ -12,7 +12,7 @@
   STROOM_LOG_SENDER_TAG="v2.2.0"
   STROOM_NGINX_TAG="v7.0.1"
   STROOM_STATS_TAG="v1.0-alpha.3"
-  STROOM_TAG="v7.7-beta.5"
+  STROOM_TAG="v7.5.5"
   STROOM_ZOOKEEPER_TAG="v1.1.2_zk-v3.4.5"
 
   # Tags for local docker builds, un-comment as needed to override