Update Helm chart promtail to v6 (#4746)

charts/stable/loki/Chart.yaml

@@ -7,7 +7,7 @@ dependencies:
   - name: "promtail"
     condition: promtail.enabled
     repository: https://charts.truecharts.org
-    version: "5.0.2"
+    version: "6.0.0"
 deprecated: false
 description: "Loki: like Prometheus, but for logs."
 home: https://truecharts.org/docs/charts/stable/loki
@@ -24,7 +24,7 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/loki
   - https://github.com/grafana/loki
 type: application
-version: 8.0.4
+version: 9.0.0
 annotations:
   truecharts.org/catagories: |
     - logs