chore(deps): update helm release loki to v6

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| helm       | loki    | 2.16.0 | 6.55.0 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

charts/loki-stack/requirements.yaml

@@ -2,7 +2,7 @@ dependencies:
 - name: "loki"
   condition: loki.enabled
   repository: "https://grafana.github.io/helm-charts"
-  version: "^2.15.2"
+  version: "^6.0.0"
 - name: "promtail"
   condition: promtail.enabled
   repository: "https://grafana.github.io/helm-charts"