chore(deps): update posthog-js (#3290)

Author: davidkonigsberg

packages/fern-dashboard/package.json

@@ -92,7 +92,7 @@
     "motion": "^12.4.7",
     "next": "15.3.0-canary.1",
     "next-themes": "^0.4.4",
-    "posthog-js": "^1.216.1",
+    "posthog-js": "^1.258.2",
     "posthog-node": "^4.5.0",
     "puppeteer-core": "^24.4.0",
     "react": "19.0.0",

packages/fern-docs/bundle/package.json

@@ -119,7 +119,7 @@
     "next": "15.3.0-canary.1",
     "next-themes": "^0.4.4",
     "parse-numeric-range": "^1.3.0",
-    "posthog-js": "^1.216.1",
+    "posthog-js": "^1.258.2",
     "pretty-bytes": "^6.1.1",
     "qs": "^6.14.0",
     "react": "19.0.0",