Bump posthog-js from 1.307.1 to 1.309.1 (#612)

Bumps [posthog-js](https://github.com/PostHog/posthog-js) from 1.307.1 to 1.309.1.
- [Release notes](https://github.com/PostHog/posthog-js/releases)
- [Changelog](https://github.com/PostHog/posthog-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/PostHog/posthog-js/compare/posthog-js@1.307.1...posthog-js@1.309.1)

---
updated-dependencies:
- dependency-name: posthog-js
  dependency-version: 1.309.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -31,7 +31,7 @@
     "lucide-react": "^0.561.0",
     "next": "16.0.10",
     "next-themes": "^0.4.6",
-    "posthog-js": "^1.307.1",
+    "posthog-js": "^1.309.1",
     "react": "^19.2.3",
     "react-dom": "^19.1.0",
     "react-hook-form": "^7.68.0",