Update the copyright for Lubuntu Developers to 2023.

debian/changelog

@@ -6,6 +6,7 @@ lubuntu-default-settings (23.04.5) UNRELEASED; urgency=medium
     lxqt-qtplugin until support is added. Feels hacky, yet a reasonable fix.
   * Drop many obsolete Breaks/Replaces, since we are far past the transition
     from LXDE.
+  * Update the copyright for Lubuntu Developers to 2023.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Tue, 24 Jan 2023 15:40:42 -0600
 

debian/copyright

@@ -4,7 +4,7 @@ Upstream-Contact: Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
 
 Files: *
 Copyright: Copyright 2009-2014 Julien Lavergne <gilir@ubuntu.com>
-           Copyright 2015-2018 Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
+           Copyright 2015-2023 Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
 License: GPL-2+
  This package is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by