fixup! core_test: py3

product/ERP5Type/mixin/temporary.py

@@ -26,11 +26,7 @@
 #
 ##############################################################################
 
-try:
-  from ZODB._compat import cPickle
-  PicklingError = cPickle.PicklingError
-except ImportError: # BBB: ZODB < 4
-  from six.moves.cPickle import PicklingError
+from zodbpickle.pickle import PicklingError
 from Acquisition import aq_base
 from Products.ERP5Type.Accessor.Constant import PropertyGetter as \
   PropertyConstantGetter