This is a rebuild/make sync for charms to pickup the fix in charmhelpers to fix a change in netaddr library not allowing falsy addresses anymore. Fix in charmhelpers is in [1]. Bump flake8 version for py312 compatibility. [1] https://github.com/juju/charm-helpers/pull/921 Change-Id: I7aefeaa46804e4d269c35580e65a816850bc512f