fix: upgrade posthog-js from 1.100.0 to 1.103.0

Snyk has created this PR to upgrade posthog-js from 1.100.0 to 1.103.0.

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

@@ -76,7 +76,7 @@
     "next": "^12.3.4",
     "nprogress": "^0.2.0",
     "picomatch": "^2.3.1",
-    "posthog-js": "^1.58.0",
+    "posthog-js": "^1.103.0",
     "query-string": "^7.1.3",
     "react": "^17.0.2",
     "react-beautiful-dnd": "^13.1.1",