Mixxx 2.5.4

This is is the 4th minor release of the Mixxx 2.5 branch.

Have a look at the CHANGELOG and the Mixxx website for more information:

• https://mixxx.org/news/2025-12-14-mixxx-2_5_4-released/
• https://github.com/mixxxdj/mixxx/blob/2.5.4/CHANGELOG.md