feature #50842 Add missing return types to magic methods (wouterj)

This PR was merged into the 6.4 branch.

Discussion
----------

Add missing return types to magic methods

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | yes
| Tickets       | -
| License       | MIT
| Doc PR        | -

I promise, these 72 methods really are the last methods that did not have a return type already 🙃

Commits
-------

6b270010c4 Add missing return types to magic methods

Author: nicolas-grekas

Pipes/UnixPipes.php

@@ -40,7 +40,7 @@ public function __sleep(): array
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
-    public function __wakeup()
+    public function __wakeup(): void
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
     }

Pipes/WindowsPipes.php

@@ -93,7 +93,7 @@ public function __sleep(): array
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
-    public function __wakeup()
+    public function __wakeup(): void
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
     }

Process.php

@@ -200,6 +200,9 @@ public function __sleep(): array
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
+    /**
+     * @return void
+     */
     public function __wakeup()
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);