Drop tox envs for end of life djangos

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 isolated_build = true
-envlist = py{310,311}-dj{31,32,40,41,42,50,latest}-{mysql,postgresql,sqlite},lint,py312-dj{50,latest}
+envlist = py{310,311}-dj{32,42,50,latest}-{mysql,postgresql,sqlite},lint,py312-dj{50,latest}
 
 [testenv]
 allowlist_externals = poetry
@@ -10,10 +10,7 @@ setenv =
     sqlite: DATABASES_MODULE=sqlite
 commands =
     poetry install --no-root --with dev
-    dj31: poetry run pip install "Django>=3.1,<3.2"
     dj32: poetry run pip install "Django>=3.2,<4.0"
-    dj40: poetry run pip install "Django>=4.0,<4.1"
-    dj41: poetry run pip install "Django>=4.1,<4.2"
     dj42: poetry run pip install "Django>=4.2,<5.0"
     dj50: poetry run pip install "Django>=5.0,<5.1"
     latest: poetry run pip install -U Django