Fix RTD build

[yakky]

Description

Pin Django version in test requirements

References

Fix #632

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [ ] Usage documentation added in case of new features
• [ ] Tests added

[github-actions[bot]]

Coverage decreased (-3.3%) to 93.437% when pulling 7396d1d614221a3e798d5ca989c4f862ecd98dd3 on bugfix/issue-632-fix-docs-build into ee6ce0562e60f416d2727d4cd34a02ef1e3216ff on develop.

[codecov[bot]]

Codecov Report

Merging #633 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #633   +/-   ##
========================================
  Coverage    94.50%   94.50%           
========================================
  Files           22       22           
  Lines         1111     1111           
  Branches       138      138           
========================================
  Hits          1050     1050           
  Misses          23       23           
  Partials        38       38           

Flag	Coverage Δ
#unittests	94.50% <ø> (ø)

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