chore: Post Django32 Cleanup

[edx-requirements-bot]

Additional information from script execution

Python code cleanup by the cleanup-python-code Jenkins job.

This pull request was generated by the cleanup-python-code Jenkins job, which ran

modernize_github_actions_django; modernize_github_actions; modernize_tox; modernize_setup_file; sed -i -E 's/django(<|>)[0-9]*\.[0-9]+/django<4.0/gi' ./requirements/constraints.txt; make upgrade;

The following packages were installed:
edx-repo-tools

[codecov]

Codecov Report

Merging #156 (9edcf48) into master (ad91dce) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #156   +/-   ##
=======================================
  Coverage   93.24%   93.24%           
=======================================
  Files          18       18           
  Lines        1969     1969           
  Branches      182      182           
=======================================
  Hits         1836     1836           
  Misses        120      120           
  Partials       13       13           

Flag	Coverage Δ
unittests	93.24% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
submissions/__init__.py	100.00% <100.00%> (ø)
submissions/models.py	92.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ad91dce...9edcf48. Read the comment docs.