feat: upgrade eslint from 5.16.0 to 9.10.0

Snyk has created this PR to upgrade eslint from 5.16.0 to 9.10.0.

See this package in npm:
eslint

See this project in Snyk:
https://app.snyk.io/org/cachiman/project/530d7b4f-6f9c-4378-b009-fd014a82c709?utm_source=github&utm_medium=referral&page=upgrade-pr

FSL-MS-Update-Leaderboard/package.json

@@ -34,7 +34,7 @@
     "chai": "^4.2.0",
     "chai-http": "^4.3.0",
     "cross-env": "^5.2.0",
-    "eslint": "^5.16.0",
+    "eslint": "^9.10.0",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-plugin-import": "^2.18.0",
     "eslint-plugin-promise": "^4.1.1",