Update npm and node engines versions

Signed-off-by: Nextcloud bot <bot@nextcloud.com>

Author: nextcloud-bot

package.json

@@ -36,5 +36,9 @@
   },
   "browserslist": [
     "extends @nextcloud/browserslist-config"
-  ]
+  ],
+  "engines": {
+    "node": "^16.0.0",
+    "npm": "^7.0.0 || ^8.0.0"
+  }
 }