Update copyright years.

debian/changelog

@@ -5,6 +5,7 @@ lxqt-powermanagement (1.3.0-0ubuntu1) UNRELEASED; urgency=medium
   * Remove redundant hardening rule.
   * Bump Standards-Version to 4.6.2, no changes needed.
   * I guess we don't require root to build, do we?
+  * Update copyright years.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Fri, 11 Aug 2023 11:33:08 -0500
 
@@ -293,4 +294,3 @@ lxqt-powermanagement (0.9.0+20150807-1) unstable; urgency=medium
   * Merging upstream version 0.9.0+20150807.
 
  -- Andrew Lee (李健秋) <ajqlee@debian.org>  Sun, 16 Aug 2015 19:19:12 +0800
-

debian/copyright

@@ -3,7 +3,7 @@ Upstream-Name: lxqt-powermanagement
 Source: https://github.com/lxqt/lxqt-powermanagement
 
 Files: *
-Copyright: 2013-2020, LXQt team
+Copyright: 2013-2023, LXQt team
            2011-2012, Razor team
 License: LGPL-2.1+
 
@@ -24,7 +24,7 @@ Copyright: 2013, Alec Moskvin <alecm@gmx.com>
 License: LGPL-2.1+
 
 Files: debian/*
-Copyright: 2021,      Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
+Copyright: 2021-2023, Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
            2014-2019, Alf Gaida <agaida@siduction.org>
            2015,      Andrew Lee (李健秋) <ajqlee@debian.org>
 License: LGPL-2.1+