Update jupyterhub to 0.9.x series

[flongford]

Approaches #605

Upgrades the version of jupyterhub to latest in 0.9.x series (0.9.6).

[flongford]

Selenium tests likely failing on Ubuntu builds due to low bandwith on GitHub CI - they pass on my local Linux machine.

It looks like a click action is being blocked by a partially visible modal so we probably just need to robustify the tests by waiting until the modal has fully disappeared from the screen before performing the click.

As reference, something similar was carried out previously in this commit: 62efbfa

[codecov-commenter]

Codecov Report

Merging #604 (8134567) into master (9081860) will increase coverage by 0.00%.
The diff coverage is 83.33%.

❗ Current head 8134567 differs from pull request most recent head a13272f. Consider uploading reports for the commit a13272f to get more accurate results

@@           Coverage Diff           @@
##           master     #604   +/-   ##
=======================================
  Coverage   94.79%   94.79%           
=======================================
  Files          93       93           
  Lines        4418     4420    +2     
  Branches      432      432           
=======================================
+ Hits         4188     4190    +2     
  Misses        168      168           
  Partials       62       62           

Impacted Files	Coverage Δ
...ager/jupyterhub/auth/simphony_remote_auth_mixin.py	38.09% <0.00%> (ø)
remoteappmanager/jupyterhub/spawners.py	87.87% <ø> (ø)
...moteappmanager/handlers/tests/test_base_handler.py	100.00% <100.00%> (ø)
remoteappmanager/jupyterhub/tests/test_spawners.py	93.01% <100.00%> (ø)

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