Qt 6.9.0 Beta3 has been released

- Qt 6.9.0 Beta3 has been released:
https://lists.qt-project.org/pipermail/development/2025-March/046172.html

- Qt 6.5.5 Open Source has been released:
https://lists.qt-project.org/pipermail/development/2025-March/046175.html

- More details about the Qt Contributor Summit 2025 are available:
https://www.qt.io/blog/qtcs25-may-7-8-9-registration-venue-and-more