Merge branch '6.1' into 6.2

* 6.1:
  [HttpKernel] Fix test sensitivity on xdebug.file_link_format
  [HttpKernel] Fix non-scalar check in surrogate fragment renderer
  [HtmlSanitizer] Allow null for sanitizer option `allowed_link_hosts` and `allowed_media_hosts`
  [Serializer] Fix wrong needsNormalization in TraceableEncoder
  [Debug][ErrorHandler] fix operator precedence
  [Cache] Ensured that redis adapter can use multiple redis sentinel hosts
  [DoctrineBridge] fix tests
  [Security] Allow redirect after login to absolute URLs

Author: nicolas-grekas

Debug/TraceableEncoder.php

@@ -14,9 +14,9 @@
 use Symfony\Component\Serializer\DataCollector\SerializerDataCollector;
 use Symfony\Component\Serializer\Encoder\DecoderInterface;
 use Symfony\Component\Serializer\Encoder\EncoderInterface;
+use Symfony\Component\Serializer\Encoder\NormalizationAwareInterface;
 use Symfony\Component\Serializer\SerializerAwareInterface;
 use Symfony\Component\Serializer\SerializerInterface;
-use Symfony\Component\Serializer\Tests\Encoder\NormalizationAwareEncoder;
 
 /**
  * Collects some data about encoding.
@@ -111,7 +111,7 @@ public function setSerializer(SerializerInterface $serializer)
 
     public function needsNormalization(): bool
     {
-        return !$this->encoder instanceof NormalizationAwareEncoder;
+        return !$this->encoder instanceof NormalizationAwareInterface;
     }
 
     /**