remove helm chart overwrites

Author: ma-hartma

inventories/group_vars/all/release_vector.yaml

@@ -32,8 +32,7 @@ metal_stack_release_vectors:
 # sonic_configdb_utils_image_tag:
 # ...
 #
-logging_chart_version: 18.3.1
-logging_chart_repo: oci://ghcr.io/grafana-community/helm-charts/loki
+
 ##
 ## for ansible roles
 ##