Drop Django < 4.2 support

[Copilot]

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

Changes

• pyproject.toml: remove Framework :: Django :: 4.0 and 4.1 classifiers
• requirements.txt: bump minimum Django from >= 2.2 to >= 4.2
• tox.ini: drop dj40/dj41 envs and their deps; remove from envlist combinations
• .github/workflows/test-package.yml: remove Django 4.0/4.1 from the CI test matrix

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 97.48%. Comparing base (361d7a0) to head (2241bb5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #481   +/-   ##
=======================================
  Coverage   97.48%   97.48%           
=======================================
  Files          40       40           
  Lines         438      438           
=======================================
  Hits          427      427           
  Misses         11       11           

Flag	Coverage Δ
unittests	97.48% <ø> (ø)

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[Copilot]

Pull request overview

This PR updates the project’s declared and tested compatibility targets to drop Django 4.0 and 4.1, making Django 4.2 (LTS) the new minimum supported version across dev requirements, tox, and CI.

Changes:

• Removed Django 4.0/4.1 tox environments and dependency factors.
• Bumped requirements.txt minimum Django version to >= 4.2.
• Updated packaging classifiers and CI test matrix to stop advertising/testing Django 4.0/4.1.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
tox.ini	Drops dj40/dj41 envs and their pinned deps from the tox matrix.
requirements.txt	Raises the minimum Django version for installed requirements to 4.2+.
pyproject.toml	Removes Django 4.0/4.1 trove classifiers to match the new support policy.
.github/workflows/test-package.yml	Removes Django 4.0/4.1 from the GitHub Actions test matrix.

Comments suppressed due to low confidence (1)

pyproject.toml:29

• PR description says Django 4.2 is the minimum supported version, but the package metadata still does not declare a Django dependency (only django-colorfield). As a result, pip can install this project alongside Django 4.0/4.1 without any resolver error, which doesn’t match the stated support policy. Consider adding a Django >= 4.2 requirement to [project].dependencies (or an appropriate extra) so the minimum version is enforced at install time, not only in CI/tox/requirements.txt.

classifiers = [
    "Development Status :: 5 - Production/Stable",
    "Environment :: Web Environment",
    "Framework :: Django",
    "Framework :: Django :: 4.2",
    "Framework :: Django :: 5.0",
    "Framework :: Django :: 5.1",
    "Framework :: Django :: 5.2",
    "Framework :: Django :: 6.0",

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