Bump version number of container stack

This is a container stack bump, because we're not really updating a setting
Instead, we are updating how the container stacks are built up.
CURA-10953

UM/Settings/ContainerStack.py

@@ -53,7 +53,7 @@ class InvalidContainerStackError(Exception):
 class ContainerStack(QObject, ContainerInterface, PluginObject):
     """A stack of setting containers to handle setting value retrieval."""
 
-    Version = 5  # type: int
+    Version = 6  # type: int
 
     def __init__(self, stack_id: str) -> None:
         """Constructor