Fix compatibility with older Symfony versions

And make testing output usable again thanks to the Slack heroes
Mateusz Sip and michalmleczko!

Author: curry684

phpunit.xml.dist

@@ -13,6 +13,7 @@
         <ini name="intl.error_level" value="0" />
         <ini name="memory_limit" value="-1" />
 
+        <env name="SHELL_VERBOSITY" value="-1" />
         <env name="SYMFONY_DEPRECATIONS_HELPER" value="weak_vendors" />
     </php>
 

src/DependencyInjection/Compiler/LocatorRegistrationPass.php

@@ -57,7 +57,7 @@ private function registerLocator(ContainerBuilder $container, string $baseTag):
         return $container
             ->register("datatables.{$baseTag}_locator", ServiceLocator::class)
             ->addTag('container.service_locator')
-            ->setPrivate(true)
+            ->setPublic(false)
             ->setArguments([$types])
         ;
     }