test(server): use Uuid::v4 for symfony/uid 5.4 compatibility

Uuid::v7() was added in symfony/uid 6.2 and breaks the Symfony 5.4
matrix job. Match the convention used elsewhere in the suite.

Author: e0ipso

tests/Unit/Capability/Registry/ReferenceHandlerTest.php

@@ -25,7 +25,7 @@ final class ReferenceHandlerTest extends TestCase
     public function testHandleDispatchesToRuntimeHandlerAndForwardsClientGateway(): void
     {
         $session = $this->createMock(SessionInterface::class);
-        $session->method('getId')->willReturn(Uuid::v7());
+        $session->method('getId')->willReturn(Uuid::v4());
 
         $runtimeHandler = new class implements RuntimeHandlerInterface {
             /** @var array<string, mixed>|null */
@@ -63,7 +63,7 @@ public function execute(array $arguments, ClientGateway $gateway): mixed
     public function testRuntimeHandlerTakesPriorityOverInvokeAndCallableDetection(): void
     {
         $session = $this->createMock(SessionInterface::class);
-        $session->method('getId')->willReturn(Uuid::v7());
+        $session->method('getId')->willReturn(Uuid::v4());
 
         $runtimeHandler = new class implements RuntimeHandlerInterface {
             public bool $executed = false;