Drop Django versions < 4.2

[Copilot]

Drop support for Django 4.0 and 4.1, keeping 4.2 (LTS) as the minimum supported version.

Changes

• pyproject.toml: Remove Framework :: Django :: 4.0 and 4.1 classifiers
• tox.ini: Remove dj40/dj41 from envlist (py310, py311) and deps
• .github/workflows/test-package.yml: Remove Django 4.0 and 4.1 from CI test matrix
• requirements.txt: Bump Django lower bound from >= 3.2 to >= 4.2

Describe your changes
Removes Django 4.0 and 4.1 from all supported version lists. Minimum supported Django version is now 4.2 LTS. The Django lower bound in requirements.txt has also been updated to >= 4.2 to keep all declared support surfaces consistent.

Related issue
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Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.13%. Comparing base (2f9ca1c) to head (f41d089).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #41   +/-   ##
=======================================
  Coverage   93.13%   93.13%           
=======================================
  Files           6        6           
  Lines         102      102           
=======================================
  Hits           95       95           
  Misses          7        7           

Flag	Coverage Δ
unittests	93.13% <ø> (ø)

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[Copilot]

Pull request overview

Drops support declarations and CI coverage for Django 4.0 and 4.1, making Django 4.2 (LTS) the minimum supported version.

Changes:

• Removed dj40/dj41 from tox envlist and dependency factor pins.
• Removed Django 4.0/4.1 Trove classifiers from package metadata.
• Removed Django 4.0/4.1 from the GitHub Actions test matrix.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tox.ini	Removes tox env factors for Django 4.0/4.1 and their pinned deps.
pyproject.toml	Removes Trove classifiers for Django 4.0/4.1.
.github/workflows/test-package.yml	Removes Django 4.0/4.1 from the CI matrix.

Comments suppressed due to low confidence (1)

tox.ini:29

• deps still installs -r requirements.txt, and requirements.txt currently allows django >= 3.2. This means some tox envs that rely only on requirements.txt (e.g. migrations/translations) can run against Django versions that are now unsupported. Update requirements.txt to require Django >= 4.2 (or explicitly pin/add a Django >=4.2 constraint in those envs) so all tox envs reflect the new minimum supported Django version.

deps =
    dj42: Django == 4.2.*
    dj50: Django == 5.0.*
    dj51: Django == 5.1.*
    dj52: Django == 5.2.*
    dj60: Django == 6.0.*
    -r requirements.txt

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