Merge branch '3.4' into 4.3

* 3.4:
  [DependencyInjection] Fix broken references in tests
  Avoid using of kernel after shutdown
  Simplify PHP CS Fixer configuration
  [FrameworkBundle] [HttpKernel] fixed correct EOL and EOM month
  Fix MockFileSessionStorageTest::sessionDir being used after it's unset
  bumped Symfony version to 3.4.34
  updated VERSION for 3.4.33
  update CONTRIBUTORS for 3.4.33
  updated CHANGELOG for 3.4.33
  [Stopwatch] Fixed a bug in stopwatch event getStartTime
  [Stopwatch] Fixed bug in getDuration when counting multiple ongoing periods
  Adding some validations tags on validators.et.xlf
  add missing translation for 94 (it)

Author: nicolas-grekas

Command/AboutCommand.php

@@ -122,7 +122,7 @@ private static function formatFileSize(string $path): string
 
     private static function isExpired(string $date): bool
     {
-        $date = \DateTime::createFromFormat('m/Y', $date);
+        $date = \DateTime::createFromFormat('d/m/Y', '01/'.$date);
 
         return false !== $date && new \DateTime() > $date->modify('last day of this month 23:59:59');
     }

Test/KernelTestCase.php

@@ -40,6 +40,7 @@ abstract class KernelTestCase extends TestCase
     private function doTearDown()
     {
         static::ensureKernelShutdown();
+        static::$kernel = null;
     }
 
     /**