Merge branch '5.4' into 6.0

* 5.4:
  Add missing return types to tests/internal/final methods
  Add type to fix 6.0 build

Author: nicolas-grekas

Tests/Authentication/AuthenticationTrustResolverTest.php

@@ -176,7 +176,7 @@ public function getCredentials(): mixed
     {
     }
 
-    public function getUser(): string|\Stringable|UserInterface
+    public function getUser(): UserInterface
     {
     }
 

Tests/Authentication/Provider/DaoAuthenticationProviderTest.php

@@ -354,8 +354,3 @@ public function upgradePassword(PasswordAuthenticatedUserInterface $user, string
 
     public function loadUserByIdentifier(string $identifier): UserInterface;
 }
-
-interface DaoAuthenticationProviderTest_UserProvider extends UserProviderInterface
-{
-    public function loadUserByUsername($username): UserInterface;
-}