[stable/magento] Remove distro tag (#8549)

Signed-off-by: Carlos Rodriguez Hernandez <crhernandez@bitnami.com>

stable/magento/Chart.yaml

@@ -1,5 +1,5 @@
 name: magento
-version: 3.1.0
+version: 3.1.1
 appVersion: 2.2.6
 description: A feature-rich flexible e-commerce solution. It includes transaction options, multi-store functionality, loyalty programs, product categorization and shopper filtering, promotion rules, and more.
 keywords:

stable/magento/values.yaml

@@ -10,7 +10,7 @@
 image:
   registry: docker.io
   repository: bitnami/magento
-  tag: 2.2.6-debian-9
+  tag: 2.2.6
   ## Specify a imagePullPolicy
   ## Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'
   ## ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images