fix(manager_versions): changed master_latest deb urls to unified build
fix(manager_versions): changed master_latest deb urls to unified build

Since individuals packackes are not created for different deb distributions,
I modified all of the master urls in manager_versions.yaml to the unified deb build.

scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests