use oauthenticator 17.2 for pkce-experiment

enables refreshing auth, used in jupyter-health

helm-charts/images/hub/pkce-requirements.txt

@@ -1,8 +1,8 @@
 # Image lives at quay.io/2i2c/pkce-experiment
-# install oauthenticator 17.1,
-# which adds PKCE support.
+# install oauthenticator 17.2,
+# which adds PKCE support (17.1) and refresh tokens (17.2).
 # experiment no longer needed when base chart is updated to z2jh 4.0.0
-oauthenticator>=17.1,<18
+oauthenticator>=17.2,<18
 
 
 # jupyterhub-configurator isn't maintained and its not intended to be developed
@@ -15,4 +15,4 @@ oauthenticator>=17.1,<18
 git+https://github.com/yuvipanda/jupyterhub-configurator@backported-jh41-compatibility
 
 # Brings in https://github.com/yuvipanda/jupyterhub-fancy-profiles
-jupyterhub-fancy-profiles==0.3.10
+jupyterhub-fancy-profiles==0.3.10