With the change from this issue, the captcha has been removed from the login page. Therefore, if your implementation project configured any of the following two configuration properties at the node /hippo:configuration/hippo:frontend/login/login/loginPage, they should be removed to prevent errors being logged during bootstrap.
If your implementation project contains any login page customizations, those may need to be updated.
The SimpleLoginPlugin has been removed. The DefaultLoginPlugin, which extended SimpleLoginPlugin prior to this change now extends LoginPlugin directly. If your implementation project extended SimpleLoginPlugin, it should be updated to extend DefaultPlugin instead.