Make module compatible with drupal/address:^2.0.

To allow compatibility with address^2.0 without having to update to a dev version of SF that has a lot of extra commits:

"repositories": [
    {
        "type": "composer",
        "url": "https://packages.drupal.org/8",
        "exclude": [
            "drupal/salesforce",
        ]
    },
    {
        "type": "git",
        "url": "https://git.drupalcode.org/issue/salesforce-3414401.git"
    },
},
"require": {
    "drupal/salesforce": "dev-3414401-address2-5.0.3#a42d9201",
}

This will install a dev version with just one extra commit.