ENGCOM-3598: Use the new json serializer which throws an error when failing #16154

 - Merge Pull Request #16154 from storefront-bvba/magento2:layout-config-serializer-fix
 - Merged commits:
   1. da7f293
   2. d7a11d7
   3. 46a9ed5
   4. 32fd4bd

Author: magento-engcom-team

lib/internal/Magento/Framework/Serialize/Test/Unit/Serializer/JsonHexTagTest.php

@@ -69,7 +69,8 @@ public function testUnserialize($value, $expected)
     /**
      * @return array
      */
-    public function unserializeDataProvider(): array {
+    public function unserializeDataProvider(): array
+    {
         return [
             ['""', ''],
             ['"string"', 'string'],
@@ -105,7 +106,8 @@ public function testUnserializeException($value)
     /**
      * @return array
      */
-    public function unserializeExceptionDataProvider(): array {
+    public function unserializeExceptionDataProvider(): array
+    {
         return [
             [''],
             [false],