Update plugin version for PHP 8.0

[jarviis101]

Could not find package phpmob/sylius-settings-plugin in any version matching your PHP version, PHP extensions and Composer version:  
    - phpmob/sylius-settings-plugin 1.1.x-dev requires php ^7.1 which does not match your installed version 8.0.19.                    
                                                                                                                                       
Additionally, the package was only found with a stability of "dev" while your minimum stability is "stable".