🐛 pin mozilla-django-oidc to <5.0.0 to avoid breaking change

[swrichards]

Closes #168.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.65%. Comparing base (99234dc) to head (4b06efb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   93.65%   93.65%           
=======================================
  Files          25       25           
  Lines         962      962           
  Branches       85       85           
=======================================
  Hits          901      901           
  Misses         42       42           
  Partials       19       19           

Flag	Coverage Δ
base	83.16% <ø> (ø)
setupconfig	93.65% <ø> (ø)

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