Bump backbeat 9.1.0-preview.2

Issue: ZENKO-5037

Author: francoisferrand

solution/deps.yaml

@@ -6,7 +6,7 @@ backbeat:
   dashboard: backbeat/backbeat-dashboards
   image: backbeat
   policy: backbeat/backbeat-policies
-  tag: 9.0.14
+  tag: 9.1.0-preview.2
   envsubst: BACKBEAT_TAG
 busybox:
   image: busybox