chore(deps): update dependency django-imagefield to v0.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-imagefield	==0.13.0 -> ==0.20.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (671cccf) 66.63% compared to head (5e67dd2) 66.63%.
Report is 1 commits behind head on master.

❗ Current head 5e67dd2 differs from pull request most recent head 80f749f. Consider uploading reports for the commit 80f749f to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1253   +/-   ##
=======================================
  Coverage   66.63%   66.63%           
=======================================
  Files         134      134           
  Lines        7880     7880           
=======================================
  Hits         5251     5251           
  Misses       2629     2629           

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