ci: add Python 3.11-3.13

Author: behrmann

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        tox_env: [py39, py310, pypy3, pep8]
+        tox_env: [py39, py310,  py311,  py312,  py313, pypy3, pep8]
 
     # Use GitHub's Linux Docker host
     runs-on: ubuntu-latest

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py310,py39,pep8,pypy3
+envlist = py313,py312,py311,py310,py39,pep8,pypy3
 
 [testenv]
 usedevelop = True