chore(deps): bump posthog-js from 1.255.0 to 1.256.2

Bumps [posthog-js](https://github.com/PostHog/posthog-js) from 1.255.0 to 1.256.2.
- [Release notes](https://github.com/PostHog/posthog-js/releases)
- [Changelog](https://github.com/PostHog/posthog-js/blob/main/CHANGELOG.md)
- [Commits](PostHog/posthog-js@v1.255.0...v1.256.2)

---
updated-dependencies:
- dependency-name: posthog-js
  dependency-version: 1.256.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -58,7 +58,7 @@
     "next": "15.3.3",
     "next-mdx-remote": "5.0.0",
     "next-themes": "0.4.6",
-    "posthog-js": "1.255.0",
+    "posthog-js": "1.256.2",
     "posthog-node": "4.17.2",
     "react": "19.1.0",
     "react-dom": "19.1.0",