[zuul] Use latest tobiko image

We can start using again the latest tobiko image as this fix [1] got
fully propagated into the latest build.

[1] https://review.opendev.org/c/x/tobiko/+/922184

.zuul.yaml

@@ -73,9 +73,6 @@
             vcpus: 1
       cifmw_test_operator_tempest_ntp_extra_images: https://download.cirros-cloud.net/0.6.2/cirros-0.6.2-x86_64-disk.img
 
-      # NOTE(lpiwowar): Remove once this fix fully propagates into the latest build of the tobiko image
-      # https://review.opendev.org/c/x/tobiko/+/922184
-      cifmw_test_operator_tobiko_image_tag: 29ed9f08be63ef47c25cbb857dbbf9d756ff5c081607e55e5237558d90aa6a13
       cifmw_test_operator_tobiko_workflow:
         - stepName: 'podified-functional'
           testenv: 'functional -- tobiko/tests/functional/podified/test_topology.py'