Update library/docker version from 28.3.3-dind to 28.4.0-dind

Author: jupyterhub-bot

helm-chart/binderhub/values.yaml

@@ -286,7 +286,7 @@ dind:
   daemonset:
     image:
       name: docker.io/library/docker
-      tag: "28.3.3-dind" # ref: https://hub.docker.com/_/docker/tags
+      tag: "28.4.0-dind" # ref: https://hub.docker.com/_/docker/tags
       pullPolicy: ""
       pullSecrets: []
     # Additional command line arguments to pass to dockerd