[bitnami/rabbitmq] Fix default empty "initContainers" object (#6902)

* Correct initContainers to empty list

* Bump patch version

Co-authored-by: Simon Harrison <simon.harrison@mediakind.com>

bitnami/rabbitmq/Chart.yaml

@@ -23,4 +23,4 @@ name: rabbitmq
 sources:
   - https://github.com/bitnami/bitnami-docker-rabbitmq
   - https://www.rabbitmq.com
-version: 8.16.2
+version: 8.16.3

bitnami/rabbitmq/values.yaml

@@ -504,7 +504,7 @@ customStartupProbe: {}
 ##       - name: portname
 ##         containerPort: 1234
 ##
-initContainers: {}
+initContainers: []
 
 ## Add sidecars to the pod.
 ## Example: