Release to unstable.

debian/changelog

@@ -1,10 +1,10 @@
-qt6-base (6.4.2+dfsg-19) UNRELEASED; urgency=medium
+qt6-base (6.4.2+dfsg-19) unstable; urgency=medium
 
   [ Patrick Franz ]
   * Backport upstream patch to fix build with libxkbcommon 1.6.0
     (Closes: #1054674).
 
- -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sat, 28 Oct 2023 11:24:24 +0200
+ -- Patrick Franz <deltaone@debian.org>  Sat, 28 Oct 2023 11:26:45 +0200
 
 qt6-base (6.4.2+dfsg-18) unstable; urgency=medium