Drop support for Python 3.8 as well

It reached EOL earlier this month:
https://devguide.python.org/versions/

Author: browniebroke

.github/workflows/test.yml

@@ -24,7 +24,6 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - "3.8"
           - "3.9"
           - "3.10"
           - "3.11"

pyproject.toml

@@ -4,7 +4,7 @@ authors = [{name = "Tim Allen", email = "[email protected]"},]
 description = "Django REST Framework renderer for Excel spreadsheet (xlsx) files."
 dynamic = ["version"]
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 keywords = ["djangorestframework", "django rest framework", "excel", "spreadsheet", "rest", "restful", "api", "xls", "xlsx", "openpyxl"]
 license = {text = "BSD-3-Clause"}
 classifiers = [

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{38,39,310,311}-dj42
+    py{39,310,311}-dj42
     py{310,311,312}-dj50
     py{310,311,312}-dj51
 skipsdist = True