chore(deps): update dependency eslint to v9

Author: renovate[bot]

Rnwood.Smtp4dev/ClientApp/package.json

@@ -30,7 +30,7 @@
     "cross-env": "^7.0.3",
     "device-sizes": "^1.2.3",
     "element-plus": "^2.7.0",
-    "eslint": "^8.57.0",
+    "eslint": "^9.0.0",
     "eslint-plugin-vue": "^9",
     "html-validate": "^9.0.0",
     "node-polyfill-webpack-plugin": "^4.0.0",