Release systemd version 247.3-6+apertis4

Signed-off-by: Vignesh Raman <vignesh.raman@collabora.com>

debian/changelog

+systemd (247.3-6+apertis4) apertis; urgency=medium
+
+  * meson: change operator combining bools from + to and
+  * meson: do not fail if rsync is not installed with meson 0.57.2
+
+ -- Vignesh Raman <vignesh.raman@collabora.com>  Fri, 25 Mar 2022 16:14:40 +0530
+
 systemd (247.3-6+apertis3) apertis; urgency=medium
 
   * systemd-journal-flush: Add a requirement on var.mount