Meta releases gemma4 model v0.20.7-rc0 with nothink renderer tests

AI Impact Summary

This release, v0.20.7-rc0, introduces a new 'nothink' renderer test for the gemma4 model. While technically a code change, this signifies ongoing development and testing of the gemma4 model's rendering capabilities. This update is likely part of a larger effort to improve the model's output quality and performance, and should be monitored for future releases.