Make comments work again on Django 3.2

[quantum5]

No description provided.

[Xyene]

LGTM

[codecov-commenter]

Codecov Report

Base: 46.50% // Head: 46.53% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (5ae6f47) compared to base (b676a49).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2016      +/-   ##
==========================================
+ Coverage   46.50%   46.53%   +0.02%     
==========================================
  Files         236      236              
  Lines       13104    13124      +20     
==========================================
+ Hits         6094     6107      +13     
- Misses       7010     7017       +7     

Impacted Files	Coverage Δ
judge/comments.py	40.86% <50.00%> (ø)
judge/utils/raw_sql.py	30.26% <50.00%> (+0.41%)	⬆️
judge/widgets/select2.py	60.39% <0.00%> (+3.72%)	⬆️

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