Declare return types to be compatible with composer 2.7+

Author: Seldaek

src/Magento/ComposerRootUpdatePlugin/Plugin/Commands/OverrideRequireCommand.php

@@ -86,7 +86,7 @@ public function setApplication(Application $application = null)
      *
      * @return void
      */
-    protected function configure()
+    protected function configure(): void
     {
         parent::configure();
 
@@ -170,7 +170,7 @@ protected function configure()
      *
      * @throws Exception
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $this->console = new Console($this->getIO(), $input->getOption(self::INTERACTIVE_OPT));
         $this->pkgUtils = new PackageUtils($this->console);