fix(apps): update Halo image tag to 2.26.0

flux/apps/helmrelease-halo.yaml

@@ -18,7 +18,7 @@ spec:
   values:
     image:
       repository: halohub/halo-pro
-      tag: 2.25.4
+      tag: 2.26.0
     service:
       type: ClusterIP
     ingress: