Revert "Force newer version of maridb than nextcloud/requirements.yaml has"

This reverts commit 92af84da.

requirements.yaml

@@ -18,7 +18,6 @@ dependencies:
       - key-value-store
       - redis
       - onlyoffice
-      - nextcloud
   - name: postgresql
     version: 7.7.0
     repository: "@stable"
@@ -26,13 +25,3 @@ dependencies:
       - postgresql
       - onlyoffice
       - database
-  # Force newer version of maridb as nextcloud/requirements.yaml have
-  # so we can use k8s 1.16
-  # See https://open.greenhost.net/openappstack/openappstack/issues/390
-  - name: mariadb
-    version: 7.1.0
-    repository: "@stable"
-    tags:
-      - mariadb
-      - nextcloud
-      - database