Merge branch '6.0' into 6.1

* 6.0:
  [SecurityBundle] Fix using same handler for multiple authenticators
  [DependencyInjection] Fix dump order of inlined deps
  [VarExporter] Fix exporting enums
  [HttpClient] Let curl handle content-length headers
  [Intl] Fix tests

Author: nicolas-grekas

Dumper/PhpDumper.php

@@ -486,7 +486,7 @@ private function collectCircularReferences(string $sourceId, array $edges, array
                             $loop = [];
                         }
                     }
-                    $this->addCircularReferences($first, $loop, true);
+                    $this->addCircularReferences($first, $loop, $loopByConstructor);
                     break;
                 }
             }

Tests/Fixtures/includes/autowiring_classes.php

@@ -15,9 +15,8 @@ class Foo
 {
     /**
      * @required
-     * @return static
      */
-    public function cloneFoo()
+    public function cloneFoo(): static
     {
         return clone $this;
     }

Tests/Fixtures/php/services_almost_circular_private.php

@@ -419,17 +419,16 @@ protected function getMonologInline_LoggerService()
      */
     protected function getPAService()
     {
-        $a = new \stdClass();
-
-        $b = ($this->privates['pC'] ?? $this->getPCService());
+        $a = ($this->privates['pC'] ?? $this->getPCService());
 
         if (isset($this->services['pA'])) {
             return $this->services['pA'];
         }
+        $b = new \stdClass();
 
-        $this->services['pA'] = $instance = new \stdClass($a, $b);
+        $this->services['pA'] = $instance = new \stdClass($b, $a);
 
-        $a->d = ($this->privates['pD'] ?? $this->getPDService());
+        $b->d = ($this->privates['pD'] ?? $this->getPDService());
 
         return $instance;
     }