Fix prometheus cadvisor kolla image build

Removed the Prometheus cadvisor version override to use kolla default,
which is now more up-to-date than the previously used version. This
fixes the kolla image build.

Author: Alex-Welsh

etc/kayobe/kolla.yml

@@ -338,8 +338,6 @@ kolla_build_args:
   node_exporter_version: "1.5.0"
   prometheus_version: "2.35.0"
   prometheus_alertmanager_version: "0.24.0"
-  prometheus_cadvisor_sha256sum: "8e3df91eee70c72ac3f3184b9fab1229b037c2e850ff1593103b2bd9028c57c0"
-  prometheus_cadvisor_version: "0.40.0"
 
 ###############################################################################
 # Kolla-ansible inventory configuration.