PHPLIB-462: require tests on PHP 7.4 to pass
PHPLIB-462: require tests on PHP 7.4 to pass

mongodb/mongo-php-library,mongodb/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library-prototype,jmikola/mongo-php-library,jmikola/mongo-php-library,mongodb/mongo-php-library,jmikola/mongo-php-library,10gen-labs/mongo-php-library-prototype,mongodb/mongo-php-library