fixup! *: use base64 encodebytes for python3.9

bt5/erp5_document_scanner/SkinTemplateItem/portal_skins/erp5_document_scanner/Base_getTempImageList.py

 """
   Proxy role as Manager is required here to access getResultList
 """
-from base64 import decodebytes
+from base64 import b64decode
 if REQUEST:
   return RuntimeError("You cannot run this script in the url")
 
@@ -11,7 +11,7 @@ pdf_data_list = []
 for result in active_process.getResultList():
   if result.reference in image_list:
     pdf_data_list.append(
-      image_module.newContent(data=decodebytes(result.detail),
+      image_module.newContent(data=b64decode(result.detail),
                               portal_type="Image",
                               temp_object=True).convert(format="pdf")[1])