Updating from 3.2.2 to 3.3.0 makes site inaccessible.

Problem/Motivation

When attempting to update from 3.2.2 to 3.3.0 using composer the whole site becomes inaccessible.

Steps to reproduce

Do command: composer require 'drupal/group:^3.3'
Result is a an error message relating to flexible_permissions
Do command composer require 'drupal/group:^3.3' -W
This appears to work including upgrading flexible_permissions to 2.0.1. However the site becomes inaccessible with the message 'The website encountered an unexpected error. Try again later.'

Proposed resolution

Remove dependency on flexible_permissions 2.0.1 and use the core Acess Policy API.

Remaining tasks

User interface changes

API changes

Data model changes