Changes

debian-bullseye-jenkins: add libcdk5-dev

Prepare for osmo-bsc I8b3d5efb769437a5d3036e1e627b8d477275d93e where
jenkins.sh will explicitly build meas_vis and configure.ac will stop if
libcdk5-dev is not installed.

Currently meas_vis only gets built if libcdk5-dev is installed, meaning
right now it doesn't get built by the jenkins verification and
master-build jobs (only by the debian package build verification).

Related: OS#5173
Change-Id: I015b6d7cb834e99ea5d04206ba5f8c519c4e6af1