setup.cfg: Add Python 3.12 and 3.13 to classifiers

These are already tested, since the GitHub Actions workflow uses the
latest 3.x version available (currently 3.13.5).

Signed-off-by: Kevin Locke <[email protected]>

Author: kevinoid

setup.cfg

@@ -35,6 +35,8 @@ classifiers =
     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
     Programming Language :: Python :: Implementation :: PyPy
     Topic :: Software Development

tox.ini

@@ -4,7 +4,7 @@ envlist =
     docs,
     lint,
     py39,
-    py310,
+    py313,
     pypy3
 isolated_build = true