chore(deps): update dependency posthog-node to v5.8.6 (#745)

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This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [posthog-node](https://redirect.github.com/PostHog/posthog-js)
([source](https://redirect.github.com/PostHog/posthog-js/tree/HEAD/packages/node))
| dependencies | patch | [`5.8.5` ->
`5.8.6`](https://renovatebot.com/diffs/npm/posthog-node/5.8.5/5.8.6) |
[![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-node)</summary>

###
[`v5.8.6`](https://redirect.github.com/PostHog/posthog-js/blob/HEAD/packages/node/CHANGELOG.md#586)

[Compare
Source](https://redirect.github.com/PostHog/posthog-js/compare/posthog-node@5.8.5...posthog-node@5.8.6)

##### Patch Changes

-
[#&#8203;2346](https://redirect.github.com/PostHog/posthog-js/pull/2346)
[`117b150`](https://redirect.github.com/PostHog/posthog-js/commit/117b15034e2740f5714b9bb249d8701c3f14c688)
Thanks [@&#8203;marandaneto](https://redirect.github.com/marandaneto)! -
fix: node onException autocapture safely access the exception\_List

</details>

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bun.lock

@@ -40,7 +40,7 @@
     "lucide-react": "0.544.0",
     "next": "15.5.3",
     "posthog-js": "1.266.3",
-    "posthog-node": "5.8.5",
+    "posthog-node": "5.8.6",
     "prettier": "3.6.2",
     "react": "19.1.1",
     "react-dom": "19.1.1",