switch to python 3

Description

using python 2 was breaking repo, switch fully to python 3

tests:

https://gitlab.e.foundation/e/priv/os/build/-/jobs/755187

https://gitlab.e.foundation/e/priv/os/build/-/jobs/755188

Issue(s)

https://gitlab.e.foundation/e/backlog/-/issues/7494

Test environment

Test procedures

Technical details

Screenshots

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation