Debian: bump copyright year to match current

Related: OS#4107
Change-Id: I581e62b5410a9dddc6b5fd974081d633cc20416d
diff --git a/debian/copyright b/debian/copyright
index c0e2b45..374c9a2 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -3,7 +3,7 @@
 Source: http://cgit.osmocom.org/osmo-hlr/
 
 Files: *
-Copyright: 2016-2017 Sysmocom s. f. m. c. GmbH <info@sysmocom.de>
+Copyright: 2016-2022 Sysmocom s. f. m. c. GmbH <info@sysmocom.de>
 License: AGPL-3+
 
 License: AGPL-3+