Bug #18766
Updated by Peter Amstutz about 2 years ago
cwltool dropped support for Python 3.6, due to upstream EOL from security updates.
The default python in Ubuntu 18.04 and Centos 7 is 3.6.
According to Michael we can install more packages for more recent Pythons:
https://github.com/common-workflow-language/cwltool/pull/1620#issuecomment-1039996592
Adjust our build environments to install & build packages against the newer Python.