upgrade phpunit: make data provider static

src/Bundle/ChillMainBundle/Tests/Serializer/Normalizer/UserNormalizerTest.php

@@ -40,7 +40,7 @@ final class UserNormalizerTest extends TestCase
     /**
      * @throws NumberParseException
      */
-    public function dataProviderUserNormalizer()
+    public static function dataProviderUserNormalizer()
     {
         $user = new User();
         $userNoPhone = new User();