telegram-desktop: fix stable-backport helper source.

helpers/make-libtgowt

 #!/bin/sh
 #
-#    Copyright (C) 2022 Luis Guzman <ark@switnet.org>
+#    Copyright (C) 2023 Luis Guzman <ark@switnet.org>
 #
 #    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
@@ -17,8 +17,8 @@
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 #
 
-VERSION=3
-EXTERNAL='deb-src http://ftp.debian.org/debian testing main'
+VERSION=4
+EXTERNAL='deb-src http://ftp.debian.org/debian stable-backports main'
 REPOKEY=648ACFD622F3D138
 BACKPORT=true
 

helpers/make-telegram-desktop

 #!/bin/sh
 #
-#    Copyright (C) 2022 Luis Guzman <ark@switnet.org>
+#    Copyright (C) 2023 Luis Guzman <ark@switnet.org>
 #
 #    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
@@ -18,7 +18,7 @@
 #
 
 VERSION=3
-EXTERNAL='deb-src http://ftp.debian.org/debian testing main'
+EXTERNAL='deb-src http://ftp.debian.org/debian stable-backports main'
 REPOKEY=648ACFD622F3D138
 BACKPORT=true