Update project_setup.md

sync python versions with those in setup.cfg

Author: cwmeijer

{{cookiecutter.directory_name}}/project_setup.md

@@ -11,10 +11,11 @@ checklist](https://guide.esciencecenter.nl/#/best_practices/checklist).
 
 This repository is set up with Python versions:
 
-- 3.6
 - 3.7
 - 3.8
 - 3.9
+- 3.10
+- 3.11
 
 Add or remove Python versions based on project requirements. See [the
 guide](https://guide.esciencecenter.nl/#/best_practices/language_guides/python) for more information about Python