update to use python 3.11 in tox

ccd3dbaf · Bjarke Madsen · b9086679 · ccd3dbaf
Commit ccd3dbaf authored Jun 22, 2023 by Bjarke Madsen
--- a/tox.ini
+++ b/tox.ini
 [tox]
-envlist = py39
+envlist = py39,py311

 [flake8]
 exclude = venv,.tox,compendium-frontend,survey-frontend