Fix Python classifiers

Author: bennylope

pyproject.toml

@@ -5,7 +5,7 @@ authors = [
 ]
 description = "Group accounts for Django"
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = {text = "BSD License"}
 classifiers = [
     "Development Status :: 5 - Production/Stable",
@@ -15,11 +15,11 @@ classifiers = [
     "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: Implementation :: CPython",
 ]
 dependencies = [