615a8e6516
Follow-up to the salvaged #43846 commits: the WhatsApp adapter moved from gateway/platforms/whatsapp.py to plugins/platforms/whatsapp/adapter.py since the PR was authored. The cherry-pick brought _listener_pids_on_port's `re.finditer` ss-fallback and the new test's import, but the new module location doesn't import `re` (latent NameError on the lsof-absent fallback path) and the test imported the old module path. Add `import re` to the adapter and repoint the test import.