Switch to Django-CITEXT for PG citext support

[codingjoe]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (746ccaa) 99.69% compared to head (f0cccb4) 100.00%.
Report is 52 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #106      +/-   ##
===========================================
+ Coverage   99.69%   100.00%   +0.30%     
===========================================
  Files          21        21              
  Lines         332       343      +11     
===========================================
+ Hits          331       343      +12     
+ Misses          1         0       -1     

Flag	Coverage Δ
3.10	93.00% <100.00%> (?)
3.11	93.00% <100.00%> (?)
3.9	92.96% <100.00%> (?)
wagtail	99.12% <100.00%> (?)

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Files	Coverage Δ
mailauth/__init__.py	100.00% <100.00%> (ø)
mailauth/contrib/user/admin.py	100.00% <100.00%> (ø)
mailauth/contrib/user/migrations/0001_initial.py	100.00% <ø> (ø)
...rib/user/migrations/0002_emailuser_session_salt.py	100.00% <ø> (ø)
...th/contrib/user/migrations/0003_ci_unique_index.py	100.00% <100.00%> (ø)
...contrib/user/migrations/0004_auto_20200812_0722.py	100.00% <ø> (ø)
...0005_emailuser_email_hash_alter_emailuser_email.py	100.00% <100.00%> (ø)
mailauth/contrib/user/models.py	100.00% <100.00%> (ø)
mailauth/contrib/user/signals.py	100.00% <100.00%> (ø)
mailauth/forms.py	100.00% <100.00%> (ø)
... and 2 more

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