Update helm values docker.io/bitnami/mariadb-galera to v10.7.4

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Author: renovate-bot

appuio/mariadb-galera/values.yaml

@@ -50,7 +50,7 @@ image:
   # -- MariaDB Galera image repository
   repository: bitnami/mariadb-galera
   # -- MariaDB Galera image tag (immutable tags are recommended)
-  tag: 10.5.12-debian-10-r1
+  tag: 10.7.4-debian-10-r1
   # -- MariaDB Galera image pull policy.
   # Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'
   ## ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images