Add missing variants field to media

[igorbrigadir]

Fix #678

Don't think we need a test for this one right? It's just adding a field that was missing.

[igorbrigadir]

I might go through and quickly check in case there's other fields that should be added

[igorbrigadir]

Finally fixed the tests... the issue was the black formatter https://pypi.org/project/black/23.1a1/#history has a pre release version, that setup.py prefers to install, while locally, pip only installs pre release versions with --pre.

The easier solution is to update your local black version to the latest pre-release:

pip install --upgrade --pre black

[edsu]

Yikes, thank you for catching that atest/test change. That looks like something I committed by mistake!