Qt Creator 16 has been released

- Qt Creator 16 has been released:
https://www.qt.io/blog/qt-creator-16-released

- Qt 6.9.0 RC has been released:
https://lists.qt-project.org/pipermail/development/2025-March/046208.html

- Extended security maintenance for Qt 5.15 starts in May:
https://www.qt.io/blog/extended-security-maintenance-for-qt-5.15-begins-may-2025