Update Helm release pod-gateway to v5.5.2

Author: renovate[bot]

cluster/apps/network/pod-vpn-gateway/helmrelease.yaml

@@ -12,7 +12,7 @@ spec:
     spec:
       # renovate: registryUrl=https://k8s-at-home.com/charts/
       chart: pod-gateway
-      version: 5.3.0
+      version: 5.5.2
       sourceRef:
         kind: HelmRepository
         name: k8s-at-home