Updates dask-gateway chart to null

Author: jacobtomlinson

daskhub/Chart.yaml

@@ -3,7 +3,7 @@ name: daskhub
 icon: https://avatars3.githubusercontent.com/u/17131925?v=3&s=200
 version: 0.0.1-set.by.chartpress
 # appVersion is set to be a combination of the dependencies
-appVersion: "jh4.3.1-dg2025.4.0"
+appVersion: "jh4.3.1-dgnull"
 description: Multi-user JupyterHub and Dask deployment.
 dependencies:
   - name: jupyterhub
@@ -13,7 +13,7 @@ dependencies:
       - child: rbac
         parent: rbac
   - name: dask-gateway
-    version: "2025.4.0"
+    version: "null"
     repository: https://helm.dask.org/
 maintainers:
   - name: Jacob Tomlinson (Nvidia)