Release to unstable.

debian/changelog

@@ -1,9 +1,9 @@
-qt6-base (6.4.2+dfsg-6) UNRELEASED; urgency=medium
+qt6-base (6.4.2+dfsg-6) unstable; urgency=medium
 
   [ Patrick Franz ]
   * Add patch to fix CVE-2023-24607 (Closes: #1031871).
 
- -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Fri, 24 Feb 2023 22:11:05 +0100
+ -- Patrick Franz <deltaone@debian.org>  Fri, 24 Feb 2023 22:31:24 +0100
 
 qt6-base (6.4.2+dfsg-5) unstable; urgency=medium