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

Pipes/UnixPipes.php

@@ -31,12 +31,12 @@ public function __construct(
         parent::__construct($input);
     }
 
-    public function __sleep(): array
+    public function __serialize(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
-    public function __wakeup(): void
+    public function __unserialize(array $data): void
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
     }

Pipes/WindowsPipes.php

@@ -87,12 +87,12 @@ public function __construct(
         parent::__construct($input);
     }
 
-    public function __sleep(): array
+    public function __serialize(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
-    public function __wakeup(): void
+    public function __unserialize(array $data): void
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
     }

Process.php

@@ -200,12 +200,12 @@ public static function fromShellCommandline(string $command, ?string $cwd = null
         return $process;
     }
 
-    public function __sleep(): array
+    public function __serialize(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
-    public function __wakeup(): void
+    public function __unserialize(array $data): void
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
     }