Drop support for Django 4.2

The project requires OperationCategory which got added in Django 5.1

Author: mikicz

pyproject.toml

@@ -15,7 +15,6 @@ classifiers = [
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
     "Framework :: Django",
-    "Framework :: Django :: 4.2",
     "Framework :: Django :: 5.2",
     "Framework :: Django :: 6.0",
 ]
@@ -29,6 +28,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry.dependencies]
 python = ">=3.10"
+django = ">=5.1"  # first version with OperationCategory
 
 [tool.ruff]
 line-length = 120

tox.ini

@@ -1,6 +1,5 @@
 [tox]
 envlist =
-    py{310,311}-dj{42}-pg{2,3}
     py{310,311,312,313,314}-dj{52}-pg{2,3}
     py{312,313,314}-dj{60}-pg{2,3}
 
@@ -23,7 +22,6 @@ deps=
     pytest-cov
     pg2: psycopg2>2.9
     pg3: psycopg>3.1
-    dj42: https://github.com/django/django/archive/stable/4.2.x.tar.gz#egg=django
     dj52: https://github.com/django/django/archive/stable/5.2.x.tar.gz#egg=django
     dj60: https://github.com/django/django/archive/stable/6.0.x.tar.gz#egg=django
 commands=