TT#124273 Update packaging for bullseye

- Switch to debhelper compat level 13.
- Switch to Standards-Version 4.5.1.
- Update copyright years.

Change-Id: I9938e387bd86a1b80fcd23c20b95732537e42ba8

debian/control

@@ -3,13 +3,13 @@ Section: utils
 Priority: optional
 Maintainer: Sipwise Development Team <support@sipwise.com>
 Build-Depends:
- debhelper-compat (= 12),
+ debhelper-compat (= 13),
  default-libmysqlclient-dev,
  libglib2.0-dev,
  libhiredis-dev,
  libjson-c-dev,
  libsystemd-dev,
-Standards-Version: 3.9.8
+Standards-Version: 4.5.1
 Homepage: https://www.sipwise.com/
 
 Package: ngcp-mediator

debian/copyright

@@ -4,7 +4,7 @@ Upstream-Contact: Sipwise Development Team <support@sipwise.com>
 
 Files: *
 Copyright:
- Copyright © 2007-2019 Sipwise GmbH, Austria
+ Copyright © 2007-2021 Sipwise GmbH, Austria
 License: GPL-3+
  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