New upstream release (6.4.2).

debian/changelog

@@ -1,9 +1,9 @@
-qt6-base (6.4.1+dfsg-2) UNRELEASED; urgency=medium
+qt6-base (6.4.2+dfsg-1) UNRELEASED; urgency=medium
 
   [ Patrick Franz ]
   * Enable link time optimization (Closes: #1015617).
 
- -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Thu, 15 Dec 2022 22:15:33 +0100
+ -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Fri, 23 Dec 2022 00:31:20 +0100
 
 qt6-base (6.4.1+dfsg-1) experimental; urgency=medium