chore(deps): update helm release greptimedb-cluster to 0.6.38

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

Author: renovate[bot]

gitops/argocd/charts/observability/greptimedb/Chart.yaml

@@ -13,7 +13,7 @@ dependencies:
   version: 0.4.0
 - name: greptimedb-cluster
   repository: https://greptimeteam.github.io/helm-charts
-  version: 0.6.19
+  version: 0.6.38
 # - name: etcd
 #   repository: oci://registry-1.docker.io/bitnamicharts/etcd
 #   version: 10.2.12