Update changelog for 1.16.0-1 release

debian/changelog

+python-pygit2 (1.16.0-1) unstable; urgency=medium
+
+  * Update d/watch to latest GitHub recipe
+  * New upstream version 1.16.0
+  * Refresh patches (no functional changes)
+  * Reactivate callback test after libgit2 fix
+
+ -- Timo Röhling <roehling@debian.org>  Tue, 15 Oct 2024 11:04:57 +0200
+
 python-pygit2 (1.15.1-5) unstable; urgency=medium
 
   * Reupload of 1.15.1-4.