Merge branch '5.4' into 6.4

* 5.4:
  [Serializer] Fix fixture
  [FrameworkBundle] Fix PHP 8.4 deprecation
  Add an experimental CI job for PHP 8.4

Author: nicolas-grekas

.github/workflows/unit-tests.yml

@@ -32,7 +32,8 @@ jobs:
           - php: '8.2'
             mode: low-deps
           - php: '8.3'
-            #mode: experimental
+          - php: '8.4'
+            mode: experimental
       fail-fast: false
 
     runs-on: ubuntu-20.04

src/Symfony/Bundle/FrameworkBundle/Console/Descriptor/TextDescriptor.php

@@ -597,7 +597,7 @@ private function formatControllerLink(mixed $controller, string $anchorText, ?ca
             } elseif (!\is_string($controller)) {
                 return $anchorText;
             } elseif (str_contains($controller, '::')) {
-                $r = new \ReflectionMethod($controller);
+                $r = new \ReflectionMethod(...explode('::', $controller, 2));
             } else {
                 $r = new \ReflectionFunction($controller);
             }

src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php

@@ -1024,6 +1024,11 @@ public function __get($name)
             return $this->foo = 123;
         }
     }
+
+    public function __isset($name)
+    {
+        return 'foo' === $name;
+    }
 }
 
 class DummyWithConstructorObject