Updated debian changelog for version 0.16.4

debian/changelog

+swh-search (0.16.4-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 0.16.4     - (tagged by Antoine Lambert
+    <anlambert@softwareheritage.org> on 2022-10-10 13:11:02 +0200)
+  * Upstream changes:     - version 0.16.4
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Mon, 10 Oct 2022 11:17:02 +0000
+
 swh-search (0.16.3-1~swh1) unstable-swh; urgency=medium
 
   * New upstream release 0.16.3     - (tagged by Valentin Lorentz