Upgrade JupyterHub to 5.4

Author: shingo78

jupyterhub/Dockerfile

@@ -1,4 +1,4 @@
-FROM jupyterhub/jupyterhub:5.2 AS builder
+FROM jupyterhub/jupyterhub:5.4 AS builder
 
 # dev tools
 RUN apt-get update && \
@@ -44,7 +44,7 @@ RUN python3 -m pip wheel --wheel-dir wheelhouse --constraint requirements \
 RUN python3 -m pip wheel --wheel-dir wheelhouse --constraint requirements \
     jupyterhub-idle-culler
 
-FROM jupyterhub/jupyterhub:5.2
+FROM jupyterhub/jupyterhub:5.4
 
 # dind
 RUN apt-get update && \