build(deps-dev): bump eslint from 8.57.1 to 9.39.2 in /clients/js-legacy

Bumps [eslint](https://github.com/eslint/eslint) from 8.57.1 to 9.39.2.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Commits](eslint/eslint@v8.57.1...v9.39.2)

---
updated-dependencies:
- dependency-name: eslint
  dependency-version: 9.39.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

clients/js-legacy/package.json

@@ -68,7 +68,7 @@
     "@typescript-eslint/eslint-plugin": "^8.39.0",
     "@typescript-eslint/parser": "^8.48.1",
     "cross-env": "^10.0.0",
-    "eslint": "^8.57.1",
+    "eslint": "^9.39.2",
     "jest": "^30.0.5",
     "prettier": "^3.6.2",
     "rimraf": "^6.0.1",