[stable/dex] Fix compatibility with Helm 3 (#17682)

Signed-off-by: Giacomo Longo <gabibbo97@gmail.com>

stable/dex/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: dex
-version: 2.4.0
+version: 2.4.1
 appVersion: 2.19.0
 description: CoreOS Dex
 keywords:

stable/dex/values.yaml

@@ -156,7 +156,7 @@ config:
     tlsCert: /etc/dex/tls/grpc/server/tls.crt
     tlsKey: /etc/dex/tls/grpc/server/tls.key
     tlsClientCA: /etc/dex/tls/grpc/ca/tls.crt
-  connectors: {}
+  connectors: []
 #  - type: github
 #    id: github
 #    name: GitHub