Issue #3172425 by mikelutz, catch: "Symfony\Component\Lock\Factory" is...

Issue #3172425 by mikelutz, catch: "Symfony\Component\Lock\Factory" is deprecated since Symfony 4.4 and will be removed in 5.0 use "Symfony\Component\Lock\LockFactory" instead

(cherry picked from commit e3045727)

core/tests/Drupal/BuildTests/Framework/BuildTestBase.php

@@ -12,7 +12,7 @@
 use Symfony\Component\BrowserKit\Client as SymfonyClient;
 use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
 use Symfony\Component\Finder\Finder;
-use Symfony\Component\Lock\Factory;
+use Symfony\Component\Lock\LockFactory;
 use Symfony\Component\Lock\Store\FlockStore;
 use Symfony\Component\Process\PhpExecutableFinder;
 use Symfony\Component\Process\Process;
@@ -465,7 +465,7 @@ protected function stopServer() {
    */
   protected function findAvailablePort() {
     $store = new FlockStore(DrupalFilesystem::getOsTemporaryDirectory());
-    $lock_factory = new Factory($store);
+    $lock_factory = new LockFactory($store);
 
     $counter = 100;
     while ($counter--) {