Update dependency eslint to v9

Author: renovate[bot]

package.json

@@ -33,7 +33,7 @@
     "@web/dev-server-esbuild": "^1.0.0",
     "@web/test-runner": "^0.16.0",
     "cem-plugin-vs-code-custom-data-generator": "^1.3.0",
-    "eslint": "^8.28.0",
+    "eslint": "^9.0.0",
     "eslint-plugin-custom-elements": "^0.0.8",
     "eslint-plugin-github": "^4.4.1",
     "typescript": "^5.0.0"