Use Json::json_encode instead of \GuzzleHttp\json_encode

src/Repository/ContentRepository.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Bolt\Repository;
 
+use Bolt\Common\Json;
 use Bolt\Configuration\Content\ContentType;
 use Bolt\Entity\Content;
 use Bolt\Enum\Statuses;
@@ -157,7 +158,7 @@ class ContentRepository extends ServiceEntityRepository
                 'field.id = slug.id'
             )
             ->andWhere('slug.value = :slug')
-            ->setParameter('slug', \GuzzleHttp\json_encode([$slug]))
+            ->setParameter('slug', Json::json_encode([$slug]))
             ->getQuery()
             ->getOneOrNullResult();
     }

src/Repository/FieldRepository.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Bolt\Repository;
 
+use Bolt\Common\Json;
 use Bolt\Entity\Field;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\ORM\QueryBuilder;
@@ -31,7 +32,7 @@ class FieldRepository extends ServiceEntityRepository
     {
         return $this->getQueryBuilder()
             ->andWhere('field.value = :slug')
-            ->setParameter('slug', \GuzzleHttp\json_encode([$slug]))
+            ->setParameter('slug', Json::json_encode([$slug]))
             ->getQuery()
             ->getOneOrNullResult();
     }

src/Storage/Query/SelectQuery.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Bolt\Storage\Query;
 
+use Bolt\Common\Json;
 use Doctrine\ORM\Query\Expr\Base;
 use Doctrine\ORM\Query\ParameterTypeInferer;
 use Doctrine\ORM\QueryBuilder;
@@ -325,7 +326,7 @@ class SelectQuery implements ContentQueryInterface
                 )
                 ->setParameter($keyParam, $key);
             foreach ($filter->getParameters() as $key => $value) {
-                $this->qb->setParameter($key, \GuzzleHttp\json_encode([$value]));
+                $this->qb->setParameter($key, Json::json_encode([$value]));
             }
         }
     }

src/Twig/JsonExtension.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Bolt\Twig;
 
+use Bolt\Common\Json;
 use Bolt\Entity\Content;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Twig\Extension\AbstractExtension;
@@ -34,7 +35,7 @@ class JsonExtension extends AbstractExtension
 
     public function jsonRecords($records): string
     {
-        return \GuzzleHttp\json_encode($this->normalizeRecords($records));
+        return Json::json_encode($this->normalizeRecords($records));
     }
 
     public function normalizeRecords($records): array