Update bitnami/mariadb-galera Docker tag to v12

Author: renovate-bot

apps/mariadb-galera/statefulset.yaml

@@ -24,7 +24,7 @@ spec:
           type: "RuntimeDefault"
       containers:
         - name: "mariadb"
-          image: "bitnami/mariadb-galera:11.8.3"
+          image: "bitnami/mariadb-galera:12.0.2"
           envFrom:
             - configMapRef:
                 name: "mariadb-galera"