Fix test_updater.py

UpdateError: Installer integrity check failed for '/var/folders/cl/np3mbdjs28sb3sgbgh67lv680000gn/T/54fda4e647fc44b2b7594bcdcb3630a4_nuxeo-drive-5.5.7.foo'
  File "nxdrive/updater/base.py", line 156, in update
    self._install(version, self._download(version))
  File "nxdrive/updater/base.py", line 207, in _download
    self._check_validity(version, path)
  File "nxdrive/updater/base.py", line 398, in _check_validity
    raise UpdateError(f"Installer integrity check failed for {filename!r}")

Update failed