Add support for Application Settings API attribute `disable_password_authentication_for_users_with_sso_identities`. API Docs: https://docs.gitlab.com/api/settings/ ## Implementation Guide * Follow the `CONTRIBUTING.md` guide for setting up your local development environment. * Clone the community fork of this project. * In `settings.go`, add a new bool field called `DisablePasswordAuthenticationForUsersWithSSOIdentities` to the `Settings` and `UpdateSettingsOptions` structs.