Merge pull request #1493 from mglants/renovate/promtail-6.x

chore(deps): update chart promtail to 6.16.0

Author: mglants

kubernetes/subterra/apps/monitoring/promtail/app/helmrelease.yaml

@@ -10,7 +10,7 @@ spec:
     spec:
       # renovate: registryUrl=https://grafana.github.io/helm-charts
       chart: promtail
-      version: 6.15.5
+      version: 6.16.0
       sourceRef:
         kind: HelmRepository
         name: grafana-charts