feat(charts): update helm release loki to 6.42.0 (was 6.40.0)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

helm-dependencies.yaml

@@ -75,7 +75,7 @@ dependencies:
     version: 30.12.11
     repository: https://helm.linkerd.io/stable
   - name: loki
-    version: 6.40.0
+    version: 6.42.0
     repository: https://grafana.github.io/helm-charts
   - name: promtail
     version: 6.17.0