Add Drush 13 support for D11

To use, add this in your repositories section in your composer.json file:

    "repositories": [
        {
            "type": "git",
            "url": "https://git.drupalcode.org/issue/media_contextual_crop-3470369.git"
        },

Then:
composer require drupal/media_contextual_crop:"dev-3470369-add-drush-13 as 2.1.x-dev" -W

Fix in release 2.1.3