fix: apps/playground-web/package.json to reduce vulnerabilities (#148)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116

Co-authored-by: snyk-bot <[email protected]>

Author: AU_gdev_19

apps/playground-web/package.json

@@ -55,7 +55,7 @@
     "@types/react": "19.1.0",
     "@types/react-dom": "19.1.2",
     "autoprefixer": "^10.4.21",
-    "eslint": "8.57.0",
+    "eslint": "9.0.0",
     "eslint-config-biome": "1.9.4",
     "eslint-config-next": "15.2.4",
     "eslint-plugin-react-compiler": "19.0.0-beta-e993439-20250405",