Folder: change syntax for base classes

Defining them like this makes it a bit easier to document the order and
it hides a inconsistent-mro pylint false positive

product/ERP5Type/Core/Folder.py

@@ -682,15 +682,22 @@ _HANDLER_LIST = (
 _BROKEN_BTREE_HANDLER = 'CMFBTreeFolderHandler'
 
 # Import order:
-# - FolderMixIn can be about anywhere, let's put it first.
-# - our CopyContainer before ObjectManager, as ObjectManager inherits from
-#   OFS.CopySupport.CopyContainer, which methods we do not want.
-# - ObjectManager before Base, as Base is only a PropertyManager (no
-#   subobjects) and inheriting from ObjectManager overrides the necessary
-#   methods.
-# - Base before generic container types, to allow customising their methods.
-# - container types, because instances of Folder must be instances of these.
-class Folder(FolderMixIn, CopyContainer, ObjectManager, Base, OFSFolder2, CMFBTreeFolder, CMFHBTreeFolder):
+_Folder_Bases = (
+  # - FolderMixIn can be about anywhere, let's put it first.
+  FolderMixIn,
+  # - our CopyContainer before ObjectManager, as ObjectManager inherits from
+  #   OFS.CopySupport.CopyContainer, which methods we do not want.
+  CopyContainer,
+  # - ObjectManager before Base, as Base is only a PropertyManager (no
+  #   subobjects) and inheriting from ObjectManager overrides the necessary
+  #   methods.
+  ObjectManager,
+  # - Base before generic container types, to allow customising their methods.
+  Base,
+  # - container types, because instances of Folder must be instances of these.
+  OFSFolder2, CMFBTreeFolder, CMFHBTreeFolder)
+
+class Folder(*_Folder_Bases):
   """
   A Folder is a subclass of Base but not of XMLObject.
   Folders are not considered as documents and are therefore