revert Python 3.11

Reviewed-by: tischrei <tino.schreiber@t-systems.com>
Co-authored-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-committed-by: Gode, Sebastian <sebastian.gode@t-systems.com>

otc_metadata/templates/tox.ini.j2

@@ -3,10 +3,8 @@ minversion = 3.1
 envlist = py39,pep8
 skipsdist = True
 ignore_basepython_conflict = True
-basepython = python3.11
 
 [testenv]
-basepython = python3.11
 usedevelop = True
 install_command = pip install {opts} {packages}
 deps =