Soledad client ImportError: No module named proxy

see https://0xacab.org/varac/platform/-/jobs/13373 at the bottom:

Jun 27 19:03:10 FAIL: Webapp > Can sync Soledad? [webapp.rb:49]:
Jun 27 19:03:10   Error running `/srv/leap/tests/server-tests/helpers/soledad_sync.py e6fd266b2b46c68c1cbfc592c71e7007 zvzVt6KdkxbfzVKug1563MTTxK4N15_jTswVAKGTpJM https://citest13373.example.org:2323/user-e6fd266b2b46c68c1cbfc592c71e7007 /usr/local/share/ca-certificates/leap_ca.crt password_p8DRgXpX7Xwk5w`:
Jun 27 19:03:10   Traceback (most recent call last):
Jun 27 19:03:10     File "/srv/leap/tests/server-tests/helpers/soledad_sync.py", line 32, in <module>
Jun 27 19:03:10       from client_side_db import get_soledad_instance
Jun 27 19:03:10     File "/srv/leap/tests/server-tests/helpers/client_side_db.py", line 16, in <module>
Jun 27 19:03:10       from leap.soledad.client import Soledad
Jun 27 19:03:10     File "/usr/lib/python2.7/dist-packages/leap/soledad/client/__init__.py", line 22, in <module>
Jun 27 19:03:10       from .api import Soledad
Jun 27 19:03:10     File "/usr/lib/python2.7/dist-packages/leap/soledad/client/api.py", line 57, in <module>
Jun 27 19:03:10       from ._db import adbapi
Jun 27 19:03:10     File "/usr/lib/python2.7/dist-packages/leap/soledad/client/_db/adbapi.py", line 29, in <module>
Jun 27 19:03:10       from zope.proxy import ProxyBase, setProxiedObject
Jun 27 19:03:10   ImportError: No module named proxy
Jun 27 19:03:10 Tests halted on failure (because of --no-continue).