Hello world (json serializer) benchmark for Symfony JSON serializer 5.0.3

Author: steevanb

.phpbenchmarks/config.yml

@@ -6,7 +6,7 @@ benchmark:
 sourceCode:
     entryPoint: public/index.php
     urls:
-        jsonSerialization: 'https://github.com/phpbenchmarks/symfony-json-serializer/blob/5.0.2_json-serialization-hello-world_0/public/index.php'
+        jsonSerialization: 'https://github.com/phpbenchmarks/symfony-json-serializer/blob/5.0.3_json-serialization-hello-world_0/public/index.php'
 coreDependency:
     name: symfony/serializer
-    version: 5.0.2
+    version: 5.0.3

.phpbenchmarks/php/7.2/composer.lock

@@ -3,7 +3,7 @@
     "license": "proprietary",
     "require": {
         "php": "^7.2",
-        "symfony/serializer": "5.0.2",
+        "symfony/serializer": "5.0.3",
         "phpbenchmarks/benchmark-json-serialization-hello-world": "1.0.0"
     }
 }