use ExternalEditor compatible with Zope4

stack/erp5/buildout.cfg

@@ -662,7 +662,7 @@ Pillow = 6.2.2
 Products.CMFActionIcons = 2.1.3
 Products.DCWorkflowGraph = 0.4.1
 # Products.ExternalEditor 2.0.0's dtml is not based on Zope2 OFS's one.
-Products.ExternalEditor = 1.1.1
+Products.ExternalEditor = 3.0.1
 #Products.GenericSetup = 1.8.6
 Products.LongRequestLogger = 2.1.0
 # Products.MimetypesRegistry 2.1 requires AccessControl>=3.0.0Acquisition.