Updated debian changelog for version 6.6.0

debian/changelog

+swh-model (6.6.0-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 6.6.0     - (tagged by Antoine Lambert
+    <anlambert@softwareheritage.org> on 2022-10-17 19:04:43 +0200)
+  * Upstream changes:     - version 6.6.0
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Mon, 17 Oct 2022 17:08:51 +0000
+
 swh-model (6.5.1-1~swh1) unstable-swh; urgency=medium
 
   * New upstream release 6.5.1     - (tagged by Antoine Lambert