Merge branch '6.4' into 7.2

* 6.4:
  [Validator] Remove comment to GitHub issue
  [Serializer] Add support for discriminator map in property normalizer
  [DependencyInjection] Fix inlining when public services are involved
  fix contracts directory name
  Fix TraceableSerializer when collected caller from array map
  [HttpClient] Limit curl's connection cache size
  [FrameworkBundle] Fix argument not provided to `add_bus_name_stamp_middleware`

Author: nicolas-grekas

Constraints/CollectionValidator.php

@@ -47,7 +47,6 @@ public function validate(mixed $value, Constraint $constraint): void
         $context = $this->context;
 
         foreach ($constraint->fields as $field => $fieldConstraint) {
-            // bug fix issue #2779
             $existsInArray = \is_array($value) && \array_key_exists($field, $value);
             $existsInArrayAccess = $value instanceof \ArrayAccess && $value->offsetExists($field);