[CI] fails due to prompt-toolkit version conflict
Currently the CI initialization fails:
The following NEW packages will be INSTALLED:
prompt-toolkit pkgs/main/noarch::prompt-toolkit-3.0.5-py_0
prompt_toolkit pkgs/main/noarch::prompt_toolkit-2.0.10-py_0
pkg_resources.ContextualVersionConflict:
(prompt-toolkit 3.0.5 (/opt/conda/envs/testenv/lib/python3.7/site-packages),
Requirement.parse('prompt-toolkit<2.1.0,>=2.0.6'), {'ptpython'})
Edited by Wout De Nolf