Hello,
For python projects, tox has been upgraded from 3.10 to 3.21.4. That
was notably to address an issue when python3.9 is defined as an
environment although it is not available in our image, tox would
fallback to whatever default python 3 instead of failing (T274232).
You can read the full tox changelog at:
https://tox.readthedocs.io/en/latest/changelog.html
If there is any issue, please file a task in Phabricator against
#continuous-integration-config
--
Antoine "hashar" Musso