[stable/rabbitmq] Update sts apiVersion to 'apps/v1' - Mandatory for K8s 1.16 (#17283)

Signed-off-by: juan131 <juan@bitnami.com>

stable/rabbitmq/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: rabbitmq
-version: 6.7.2
+version: 6.7.3
 appVersion: 3.7.18
 description: Open source message broker software that implements the Advanced Message Queuing Protocol (AMQP)
 keywords:

stable/rabbitmq/templates/statefulset.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1beta2
+apiVersion: apps/v1
 kind: StatefulSet
 metadata:
   name: {{ template "rabbitmq.fullname" . }}