fix: upgrade posthog-js from 1.257.0 to 1.260.1

Snyk has created this PR to upgrade posthog-js from 1.257.0 to 1.260.1.

See this package in npm:
posthog-js

See this project in Snyk:
https://app.snyk.io/org/baderdean/project/078e43cc-a7a6-4d9e-b0bd-a5c5856b6128?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

frontend/package-lock.json

@@ -58,7 +58,7 @@
     "@sentry/nuxt": "^9.40.0",
     "@vueuse/core": "^13.5.0",
     "@vueuse/nuxt": "^13.5.0",
-    "posthog-js": "^1.257.0",
+    "posthog-js": "^1.260.1",
     "read-excel-file": "^5.8.8"
   }
 }