Log Message:
qt5: updated to 5.12.3

Qt 5.12.3, the third patch release of Qt 5.12 LTS, is released today. While not \ 
adding new features, the Qt 5.12.3 release provides a number of bug fixes, as \ 
well as performance and other improvements.

Compared to Qt 5.12.2, the new Qt 5.12.3 provides almost 200 bug fixes. For \ 
details of the most important changes, please check the Change files of Qt \ 
5.12.3.

Qt 5.12 LTS will receive many more patch releases throughout the coming years \ 
and we recommend all active developed projects to migrate to Qt 5.12 LTS. Qt 5.9 \ 
LTS is currently in ‘Strict’ phase and receives only the selected important \ 
bug and security fixes, while Qt 5.12 LTS is currently receiving all the bug \ 
fixes. Qt 5.6 Support has ended in March 2019, so all active projects still \ 
using Qt 5.6 LTS should migrate to a later version of Qt.