Update composer 1 warning to announce EOL date

src/Package/SymlinkDumper.php

@@ -315,7 +315,7 @@ public function dump(array $packageIds, bool $force = false, bool $verbose = fal
                 'api-url' => $this->router->generate('api_security_advisories', [], UrlGeneratorInterface::ABSOLUTE_URL),
             ];
             $this->rootFile['providers-api'] = str_replace('VND/PKG', '%package%', $this->router->generate('view_providers', ['name' => 'VND/PKG', '_format' => 'json'], UrlGeneratorInterface::ABSOLUTE_URL));
-            $this->rootFile['warning'] = 'Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer 2. See https://blog.packagist.com/deprecating-composer-1-support/';
+            $this->rootFile['warning'] = 'Support for Composer 1 will be shutdown on August 1st 2025. You should upgrade to Composer 2. See https://blog.packagist.com/shutting-down-packagist-org-support-for-composer-1-x/';
             $this->rootFile['warning-versions'] = '<1.99';
 
             if ($verbose) {