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

Authenticator/Debug/TraceableAuthenticator.php

@@ -97,7 +97,7 @@ public function getAuthenticator(): AuthenticatorInterface
         return $this->authenticator;
     }
 
-    public function __call($method, $args)
+    public function __call($method, $args): mixed
     {
         return $this->authenticator->{$method}(...$args);
     }

Firewall/AbstractListener.php

@@ -20,7 +20,7 @@
  */
 abstract class AbstractListener implements FirewallListenerInterface
 {
-    final public function __invoke(RequestEvent $event)
+    final public function __invoke(RequestEvent $event): void
     {
         if (false !== $this->supports($event->getRequest())) {
             $this->authenticate($event);