chore(deps): update dependency posthog-js to v1.259.0 (#643)

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 | minor | [`1.258.6` ->
`1.259.0`](https://renovatebot.com/diffs/npm/posthog-js/1.258.6/1.259.0)
| [![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>

###
[`v1.259.0`](https://redirect.github.com/PostHog/posthog-js/releases/tag/posthog-js%401.259.0)

[Compare
Source](https://redirect.github.com/PostHog/posthog-js/compare/posthog-js@1.258.6...posthog-js@1.259.0)

#### 1.259.0

##### Minor Changes

-
[#&#8203;2192](https://redirect.github.com/PostHog/posthog-js/pull/2192)
[`dec3f44`](https://redirect.github.com/PostHog/posthog-js/commit/dec3f443465787216ee3015aa254c5312659ad3f)
Thanks [@&#8203;marandaneto](https://redirect.github.com/marandaneto)! -
survey support for feature flag variants

</details>

---

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bun.lock

@@ -39,7 +39,7 @@
     "gray-matter": "4.0.3",
     "lucide-react": "0.539.0",
     "next": "15.4.6",
-    "posthog-js": "1.258.6",
+    "posthog-js": "1.259.0",
     "posthog-node": "5.6.0",
     "prettier": "3.6.2",
     "react": "19.1.1",