chore(deps): update dependency posthog-js to v1.258.6 (#639)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [posthog-js](https://posthog.com/docs/libraries/js)
([source](https://redirect.github.com/PostHog/posthog-js)) |
dependencies | patch | [`1.258.5` ->
`1.258.6`](https://renovatebot.com/diffs/npm/posthog-js/1.258.5/1.258.6)
| [![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/PostHog/posthog-js/badge)](https://securityscorecards.dev/viewer/?uri=github.com/PostHog/posthog-js)
|

---

### Release Notes

<details>
<summary>PostHog/posthog-js (posthog-js)</summary>

###
[`v1.258.6`](https://redirect.github.com/PostHog/posthog-js/releases/tag/posthog-js%401.258.6)

[Compare
Source](https://redirect.github.com/PostHog/posthog-js/compare/posthog-js@1.258.5...posthog-js@1.258.6)

##### 1.258.6

##### Patch Changes

-
[#&#8203;2194](https://redirect.github.com/PostHog/posthog-js/pull/2194)
[`faa2f28`](https://redirect.github.com/PostHog/posthog-js/commit/faa2f2868762c527148d9a59098d4eae7f0b3ffb)
Thanks [@&#8203;realguse](https://redirect.github.com/realguse)! - block
vercel screenshot bot

</details>

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bun.lock

@@ -39,7 +39,7 @@
     "gray-matter": "4.0.3",
     "lucide-react": "0.536.0",
     "next": "15.4.5",
-    "posthog-js": "1.258.5",
+    "posthog-js": "1.258.6",
     "posthog-node": "5.6.0",
     "prettier": "3.6.2",
     "react": "19.1.1",