Merge branch '6.4' into 7.0

* 6.4: (28 commits)
  [Serializer] Fix `@method` annotation
  fix compatibility with Doctrine DBAL 4
  ensure string type with mbstring func overloading enabled
  [HttpKernel] Fix quotes expectations in tests
  [Validator] updated Greek translation
  [Cache][HttpFoundation][Lock] Fix empty username/password for PDO PostgreSQL
  [HttpClient][WebProfilerBundle] Do not generate cURL command when files are uploaded
  render newline in front of all script elements
  fix test fixture
  fix tests
  [Cache] Fix property types in PdoAdapter
  PHP files cannot be executable without shebang
  [TwigBridge] Mark CodeExtension as @internal
  Remove full DSNs from exception messages
  [Yaml] Fix uid binary parsing
  Disable the "Copy as cURL" button when the debug info are disabled
  [HttpClient] Replace `escapeshellarg` to prevent overpassing `ARG_MAX`
  Fix missing `profile` option for console commands
  [HttpFoundation][Lock] Makes MongoDB adapters usable with `ext-mongodb` only
  [HttpKernel] Preventing error 500 when function putenv is disabled
  ...

Tests/Resources/TranslationFilesTest.php

@@ -31,8 +31,6 @@ public function testTranslationFileIsValid($filePath)
 
     /**
      * @dataProvider provideTranslationFiles
-     *
-     * @group Legacy
      */
     public function testTranslationFileIsValidWithoutEntityLoader($filePath)
     {