[incubator/vault] update storage default value to fix helm warnings (#18945)

Signed-off-by: Stefan Schwarz <ssz@bitsbeats.com>

incubator/vault/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: A Helm chart for Vault, a tool for managing secrets
 name: vault
-version: 0.23.1
+version: 0.23.2
 appVersion: 1.2.3
 home: https://www.vaultproject.io/
 icon: https://www.vaultproject.io/assets/images/mega-nav/logo-vault-0f83e3d2.svg

incubator/vault/values.yaml

@@ -258,7 +258,7 @@ vault:
         # tls_cert_file: /vault/tls/server.crt
         # tls_key_file: /vault/tls/server.key
     # See https://www.vaultproject.io/docs/configuration/storage/ for storage backends
-    storage: []
+    storage: {}
       # consul:
       #   address: ""
       #   path: ""