chore: adjust ESLint config to work with ESLint v9

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

.eslintrc.json

@@ -0,0 +1,8 @@
+/*!
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: CC0-1.0
+ */
+
+import { recommendedLibrary } from '@nextcloud/eslint-config'
+
+export default [...recommendedLibrary]