CI - Add php version check
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The version should be compatible with PHP 7.0 -
The version should be compatible with PHP 7.1 -
The version should be compatible with PHP 7.2 -
The version should be compatible with PHP 7.3 -
The version should be compatible with PHP 7.4 -
The version should be compatible with PHP 8.0
https://lw-scm.de/meeting-jesus/woocommerce-subscribe-to-phplist/-/blob/master/_ci/test.php-lint.yml