Add Django 4.1 and 4.2 support

[adamchainz]

I discovered which files to change by checking the last Django version update: 593fa02

[adamchainz]

This fixes the Django 4.0+ warning:

django.utils.deprecation.RemovedInDjango50Warning: The default value of USE_TZ will change from False to True in Django 5.0. Set USE_TZ to False in your project settings if you want to keep the current default behavior.

ref https://docs.djangoproject.com/en/4.0/releases/4.0/#time-zone-support

[adamchainz]

Added Django 4.2 to this PR.

[georgek]

LGTM. Also fixes the import issue in a better way than I did in #136 . Just need to fix the linting errors on the py310-djqa test. Will have a look tomorrow.

[codecov]

Codecov Report

Merging #127 (30b60a8) into master (40fc72d) will not change coverage.
The diff coverage is n/a.

❗ Current head 30b60a8 differs from pull request most recent head f7b67d7. Consider uploading reports for the commit f7b67d7 to get more accurate results

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files           2        2           
  Lines         138      138           
  Branches       18       18           
=======================================
  Hits          124      124           
  Misses          9        9           
  Partials        5        5           

see 1 file with indirect coverage changes

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