bump debian package version

debian/changelog

+goatherd (0.7) unstable; urgency=medium
+
+  * Fix authentication issues on bullseye by fixing tls to version 1.2
+  * Cleanup ci-pipelines
+  * Minor code cleanup
+  * Remove vendor-files and use go-get during package buildprocess
+
+ -- Thomas Preisner <ty28wuqu@cip.cs.fau.de>  Mon, 24 Jan 2022 22:15:53 +0100
+
 goatherd (0.6) unstable; urgency=medium
 
   * Makefile: reference external libraries after source files