Updated debian changelog for version 4.4.0

debian/changelog

+swh-model (4.4.0-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 4.4.0     - (tagged by Valentin Lorentz
+    <vlorentz@softwareheritage.org> on 2022-01-21 14:08:57 +0100)
+  * Upstream changes:     - v4.4.0     - * model: Add support for more
+    edge cases in _parse_offset_bytes     - * model: Add method
+    'TimestampWithTimezone.offset_minutes'
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Fri, 21 Jan 2022 13:12:25 +0000
+
 swh-model (4.3.0-1~swh1) unstable-swh; urgency=medium
 
   * New upstream release 4.3.0     - (tagged by Valentin Lorentz