fix: upgrade posthog-js from 1.53.4 to 1.54.0

Snyk has created this PR to upgrade posthog-js from 1.53.4 to 1.54.0.

See this package in npm:
https://www.npmjs.com/package/posthog-js

See this project in Snyk:
https://app.snyk.io/org/maidul98/project/53d4ecb6-6cc1-4918-aa73-bf9cae4ffd13?utm_source=github&utm_medium=referral&page=upgrade-pr

frontend/package.json

@@ -64,7 +64,7 @@
     "lottie-react": "^2.4.0",
     "markdown-it": "^13.0.1",
     "next": "^12.3.4",
-    "posthog-js": "^1.39.4",
+    "posthog-js": "^1.54.0",
     "query-string": "^7.1.3",
     "react": "^17.0.2",
     "react-beautiful-dnd": "^13.1.1",