Merge branch '7.4' into 8.0

* 7.4:
  [Mime] Deprecate implementing `__sleep/wakeup()` on `AbstractPart` implementations
  [Validator] Deprecate implementing `__sleep/wakeup()` on GenericMetadata implementations
  [String] Deprecate implementing `__sleep/wakeup()` on string implementations
  More cleanups related to internal sleep/wakeup usages
  [HttpKernel] Deprecate `__sleep/wakeup()` on kernels and data collectors and make `Profile` final
  [Serializer] Make `AttributeMetadata` and `ClassMetadata` final
  Replace __sleep/wakeup() by __(un)serialize() when BC isn't a concern
  chore: PHP CS Fixer - simplify config

Author: nicolas-grekas

Legacy/SymfonyTestsListenerTrait.php

@@ -92,12 +92,12 @@ public function __construct(array $mockedNamespaces = [])
         }
     }
 
-    public function __sleep()
+    public function __serialize(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
-    public function __wakeup()
+    public function __unserialize(array $data): void
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
     }

composer.json

@@ -23,7 +23,7 @@
         "php": ">=8.1.0"
     },
     "require-dev": {
-        "symfony/deprecation-contracts": "^2.5|^3.0",
+        "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/error-handler": "^6.4.3|^7.0.3|^8.0"
     },
     "autoload": {