minor #33154 Parameter type leftovers (derrabus)

This PR was merged into the 5.0-dev branch.

Discussion
----------

Parameter type leftovers

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #32179
| License       | MIT
| Doc PR        | N/A

Commits
-------

34eda04866 Added more parameter type declarations.

Author: nicolas-grekas

Exception/CustomUserMessageAuthenticationException.php

@@ -39,7 +39,7 @@ public function __construct(string $message = '', array $messageData = [], int $
      * @param string $messageKey  The message or message key
      * @param array  $messageData Data to be passed into the translator
      */
-    public function setSafeMessage($messageKey, array $messageData = [])
+    public function setSafeMessage(string $messageKey, array $messageData = [])
     {
         $this->messageKey = $messageKey;
         $this->messageData = $messageData;

Exception/UsernameNotFoundException.php

@@ -41,10 +41,8 @@ public function getUsername()
 
     /**
      * Set the username.
-     *
-     * @param string $username
      */
-    public function setUsername($username)
+    public function setUsername(string $username)
     {
         $this->username = $username;
     }