component/zodbtools: repair tests on py3 after update ZODB versions
after 0ae76a29 (component/ZODB: update to current versions on py3, 2025-04-14) we have a new dependency to zope.deferredimport, which depends on zope.proxy and these were not pinned here.
See discussions on https://lab.nexedi.com/nexedi/slapos/-/merge_requests/1789#note_232542