Remove deprecation warning for Django 4.0 in tests

[hmpf]

Stops the following warning:

RemovedInDjango40Warning: Passing None for the middleware get_response argument is deprecated

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.14%. Comparing base (0fe59ef) to head (3cc139d).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2844      +/-   ##
==========================================
- Coverage   57.14%   57.14%   -0.01%     
==========================================
  Files         567      567              
  Lines       41268    41267       -1     
==========================================
- Hits        23584    23583       -1     
  Misses      17684    17684              

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[github-actions]

Test results

     12 files       12 suites   12m 1s ⏱️
3 308 tests 3 308 ✔️ 0 💤 0 ❌
9 399 runs  9 399 ✔️ 0 💤 0 ❌

Results for commit 3cc139d.