Release to unstable.

debian/changelog

@@ -1,4 +1,4 @@
-qt6-base (6.4.2+dfsg-1) UNRELEASED; urgency=medium
+qt6-base (6.4.2+dfsg-1) unstable; urgency=medium
 
   [ Patrick Franz ]
   * Switch to the official 6.4.2 tarball, the tarball is the same.
@@ -13,7 +13,7 @@ qt6-base (6.4.2+dfsg-1) UNRELEASED; urgency=medium
     + Add excess files to debian/not-installed.
   * Install <triplet>-qmake6 cross wrapper (Closes: #1025663).
 
- -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sat, 21 Jan 2023 13:42:21 +0100
+ -- Patrick Franz <deltaone@debian.org>  Tue, 31 Jan 2023 19:16:32 +0100
 
 qt6-base (6.4.2+dfsg~rc1-3) unstable; urgency=medium