chore(deps): update helm release mimir-distributed to v6

Author: renovate[bot]

kustomize/bases/grafana-mimir/kustomization.yaml

@@ -5,7 +5,7 @@ namespace: observability
 helmCharts:
   - name: mimir-distributed
     repo: https://grafana.github.io/helm-charts
-    version: 5.8.0
+    version: 6.0.3
     releaseName: mimir
     namespace: observability
     valuesFile: helm-values.yaml