chore: add @eslint/js dependency to fix CI linting error

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

package.json

@@ -6,6 +6,7 @@
   "devDependencies": {
     "@cloudflare/vitest-pool-workers": "^0.12.18",
     "@cloudflare/workers-types": "^4.20260303.0",
+    "@eslint/js": "^9.39.3",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-jsdoc": "^62.7.1",