WIP: Upgrade devise to 4.4.x

This is a required step. Blocked by this extension: phatworx/devise_security_extension#192

Possible solution: forked gem devise-security: https://github.com/devise-security/devise-security

Gemfile

@@ -16,7 +16,7 @@ gem 'active_model_serializers', '~> 0.10.1'
 gem 'azure-storage'
 gem 'bootstrap-sass'
 gem 'bowndler', github: 'moneyadviceservice/bowndler'
-gem 'devise', '3.5.10'
+gem 'devise', '~> 4.4'
 gem 'devise_invitable', '1.6.1'
 gem 'devise_security_extension'
 # Dough assets are loaded from a CDN instead of from the Gem. Do make sure that