Headscale: Upgrade to 0.25.1

Update configuration template.

Change-Id: I3029e6eda0f5f049e28e9418ec1e596c78d25a57
diff --git a/charts/headscale/values.yaml b/charts/headscale/values.yaml
index 0237ba5..c65a8df 100644
--- a/charts/headscale/values.yaml
+++ b/charts/headscale/values.yaml
@@ -1,6 +1,6 @@
 image:
   repository: headscale/headscale
-  tag: 0.22.3
+  tag: 0.25.1
   pullPolicy: IfNotPresent
 storage:
   size: 5Gi