Add dh-apparmor in Build-Deps

debian/control

@@ -14,6 +14,7 @@ Vcs-Git: https://salsa.debian.org/systemd-team/systemd.git
 Vcs-Browser: https://salsa.debian.org/systemd-team/systemd
 Homepage: https://www.freedesktop.org/wiki/Software/systemd
 Build-Depends: debhelper-compat (= 13),
+               dh-apparmor,
                dh-exec,
                dh-package-notes,
                dh-sequence-installnss,