Revert to ptest-runner from upstream meta
ptest-runner v2.4.2 no longer works with master however, when we revert to the SHA in meta:master, we see a new problem where the docker CLI thread seems to get stuck.
Revert to the SHA in meta:master.
To avoid the docker CLI issue, re-base this MR after !147 (merged) is merged and cherry-picked to main
Edited by Adam Johnston