N°3091 Update PHPUnit to 8.5 : fix setUp and teardDown methods signatures on support/3.0 new tests

test/integration/iTopXmlVersionChecklistTest.php

@@ -32,7 +32,7 @@ use iTopDesignFormat;
  */
 class iTopXmlVersionIntegrationTest extends ItopTestCase
 {
-	protected function setUp()
+	protected function setUp(): void
 	{
 		parent::setUp();