chore(deps): update dependency posthog-node to v5.5.0 (#589)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [posthog-node](https://redirect.github.com/PostHog/posthog-js-lite)
([source](https://redirect.github.com/PostHog/posthog-js-lite/tree/HEAD/posthog-node))
| dependencies | minor | [`5.4.0` ->
`5.5.0`](https://renovatebot.com/diffs/npm/posthog-node/5.4.0/5.5.0) |
[![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/PostHog/posthog-js-lite/badge)](https://securityscorecards.dev/viewer/?uri=github.com/PostHog/posthog-js-lite)
|

---

### Release Notes

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

###
[`v5.5.0`](https://redirect.github.com/PostHog/posthog-js-lite/blob/HEAD/posthog-node/CHANGELOG.md#550--2025-07-10)

[Compare
Source](https://redirect.github.com/PostHog/posthog-js-lite/compare/posthog-node-v5.4.0...posthog-node-v5.5.0)

1. feat: make the `sendFeatureFlags` parameter more declarative and
ergonomic. Implementation notes below:

Modified `sendFeatureFlags` to be type `boolean |
SendFeatureFlagsOptions`, (which is defined thusly)

```ts
export interface SendFeatureFlagsOptions {
  onlyEvaluateLocally?: boolean
  personProperties?: Record<string, any>
  groupProperties?: Record<string, Record<string, any>>
}
```

This lets users declare (1) whether to use local evaluation, and (2)
which properties to supply explicitly for that evaluation, every time
they want to send feature flags. It also supports the old boolean
behavior if folks don't care and would rather the SDK infer it.

Now, you can make calls like this

```ts
posthog.captureImmediate({
  distinctId: "user123",
  event: "test event",
  sendFeatureFlags: {
    onlyEvaluateLocally: true,
    personProperties: {
      plan: "premium",
    },
  },
  properties: {
    foo: "bar",
  },
});
```

or simply

```
posthog.captureImmediate({
  distinctId: "user123",
  event: "test event",
  sendFeatureFlags: true // this will still infer local evaluation if it appears to be configured, but it won't try to pull properties from the event message
  properties: {
    foo: "bar",
  },
});
```

</details>

---

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---

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## Summary by Sourcery

New Features:
- Support declarative sendFeatureFlags parameter accepting boolean or
options object with local evaluation and property overrides by default

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

bun.lock

@@ -40,7 +40,7 @@
     "lucide-react": "0.525.0",
     "next": "15.3.5",
     "posthog-js": "1.257.0",
-    "posthog-node": "5.4.0",
+    "posthog-node": "5.5.0",
     "prettier": "3.6.2",
     "react": "19.1.0",
     "react-dom": "19.1.0",