Drop python 3.8 support as well, it's EOL in 2024

Author: agateblue

.github/workflows/tests.yml

@@ -14,7 +14,6 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - '3.8'
           - '3.9'
           - '3.10'
           - '3.11'

tox.ini

@@ -5,7 +5,7 @@
 
 [tox]
 envlist =
-    {py38,py39,py310,py311,py312}-django-42
+    {py39,py310,py311,py312}-django-42
     {py310,py311,py312,py313}-django-51
     {py313}-django-main
 
@@ -29,7 +29,6 @@ basepython =
     py311: python3.11
     py310: python3.10
     py39: python3.9
-    py38: python3.8
 
 [testenv:py313-django-main]
 ignore_outcome = true