Fix installability on v2022dev2

Demote dependency on ribchester to a suggests since we no longer ship
the Canterbury appfw on the Bullseye based v2022dev2.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

debian/control

@@ -23,8 +23,9 @@ Depends:
  python3-xdg,
  python3-paramiko,
  python3-gi,
- ribchester (>= 0.1612.7),
  systemd-container
+Suggests:
+ ribchester (>= 0.1612.7)
 Recommends: gcc-arm-linux-gnueabihf
 Description: Apertis development tools to help building, deploying and
  debugging applications