CircuitPython 5.3.0-rc.0 released!

From the GitHub release page: This is CircuitPython 5.3.0-rc0, the latest minor revision of CircuitPython, and a release candidate. If this release does not have show-stopper issues, it will be re-released as 5.3.0, the first 5.3.x stable release. This release adds support for 3 new boards, adds the RGBMatrix driver...