Headscale: Upgrade to 0.25.1

Update configuration template.

Change-Id: I3029e6eda0f5f049e28e9418ec1e596c78d25a57
diff --git a/core/installer/values-tmpl/headscale.cue b/core/installer/values-tmpl/headscale.cue
index fb146ed..c28926e 100644
--- a/core/installer/values-tmpl/headscale.cue
+++ b/core/installer/values-tmpl/headscale.cue
@@ -16,7 +16,7 @@
 		headscale: {
 			repository: "headscale"
 			name: "headscale"
-			tag: "0.22.3"
+			tag: "0.25.1"
 			pullPolicy: "IfNotPresent"
 		}
 		api: {