MT#55283 Bump copyright year

Change-Id: Ief5cba0467c1037bab0ab53169dcd95ea5a2e8a1

debian/copyright

@@ -5,7 +5,7 @@ Upstream-Contact: Sipwise Development Team <support@sipwise.com>
 Files:
  *
 Copyright:
- 2007-2025 Sipwise GmbH, Austria
+ 2007-2026 Sipwise GmbH, Austria
 License: GPL-3+ with OpenSSL exception
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by