Merge branch '3.4' into 4.3

* 3.4:
  Adopt `@PHPUnit55Migration:risky` rule of php-cs-fixer

Author: nicolas-grekas

Tests/InlineTest.php

@@ -656,7 +656,6 @@ public function testTheEmptyStringIsAValidMappingKey()
     }
 
     /**
-     *
      * @dataProvider getNotPhpCompatibleMappingKeyData
      */
     public function testImplicitStringCastingOfMappingKeysIsDeprecated($yaml, $expected)

Tests/ParserTest.php

@@ -13,7 +13,6 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
-use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Tag\TaggedValue;
 use Symfony\Component\Yaml\Yaml;
@@ -786,7 +785,6 @@ public function testScalarInSequence()
     }
 
     /**
-     *
      * > It is an error for two equal keys to appear in the same mapping node.
      * > In such a case the YAML processor may continue, ignoring the second
      * > "key: value" pair and issuing an appropriate warning. This strategy