The tested stable branch is created as pre-work for Python 3.12 which impacts the repository including Python code and UI packages involved. This supports robot framework versions greater than 7.0 and Python levels lesser than 3.12
Please point to the v6.0-stable branch if you still want to continue using the older versions of Python level < 3.12 and robot packages in your setup.
Tested:
Tested version level:
Robot Framework 7.1.1 (Python 3.10.12 on linux)