Drop support for Django 3.1 and 3.0

[tim-schilling]

No description provided.

[codecov]

Codecov Report

Merging #197 (a812897) into master (11e7b96) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

❗ Current head a812897 differs from pull request most recent head ac5bff8. Consider uploading reports for the commit ac5bff8 to get more accurate results

@@             Coverage Diff             @@
##            master     #197      +/-   ##
===========================================
- Coverage   100.00%   99.81%   -0.19%     
===========================================
  Files           32       32              
  Lines         1104     1101       -3     
  Branches       184      183       -1     
===========================================
- Hits          1104     1099       -5     
- Misses           0        1       +1     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
strawberry_django_jwt/testcases.py	97.56% <100.00%> (-2.44%)	⬇️

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[tim-schilling]

Superseded by #198