bumping to php 7.5 to stay on supported version

Author: weaverryan

symfony/phpunit-bridge/4.1/phpunit.xml.dist

@@ -12,7 +12,7 @@
         <server name="APP_ENV" value="test" force="true" />
         <server name="SHELL_VERBOSITY" value="-1" />
         <server name="SYMFONY_PHPUNIT_REMOVE" value="" />
-        <server name="SYMFONY_PHPUNIT_VERSION" value="6.5" />
+        <server name="SYMFONY_PHPUNIT_VERSION" value="7.5" />
     </php>
 
     <testsuites>