chore(deps): update dependency posthog-js to v1.311.0 (#1044)

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 | [`1.310.1` ->
`1.311.0`](https://renovatebot.com/diffs/npm/posthog-js/1.310.1/1.311.0)
| [![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>

###
[`v1.311.0`](https://redirect.github.com/PostHog/posthog-js/releases/tag/posthog-js%401.311.0)

[Compare
Source](https://redirect.github.com/PostHog/posthog-js/compare/posthog-js@1.310.2...posthog-js@1.311.0)

#### 1.311.0

##### Minor Changes

-
[#&#8203;2813](https://redirect.github.com/PostHog/posthog-js/pull/2813)
[`4b7443c`](https://redirect.github.com/PostHog/posthog-js/commit/4b7443c10e93d4647c84751e07500c416b140457)
Thanks [@&#8203;ordehi](https://redirect.github.com/ordehi)! -
feat(flags): add updateFlags() method for injecting flags without
network request

Adds `posthog.updateFlags(flags, payloads?, options?)` to inject feature
flag values from an external source (e.g., server-side evaluation, edge
middleware) without making a network request. Supports `{ merge: true }`
option to merge with existing flags instead of replacing. (2025-12-29)

###
[`v1.310.2`](https://redirect.github.com/PostHog/posthog-js/compare/posthog-js@1.310.1...posthog-js@1.310.2)

[Compare
Source](https://redirect.github.com/PostHog/posthog-js/compare/posthog-js@1.310.1...posthog-js@1.310.2)

</details>

---

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---

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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Upgrade posthog-js from 1.310.1 to 1.311.0. This adds the updateFlags()
API to inject feature flags without a network request, with an option to
merge with existing flags.

<sup>Written for commit 599df8e.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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

@@ -43,7 +43,7 @@
     "mermaid": "11.12.2",
     "next": "16.1.1",
     "next-validate-link": "1.6.3",
-    "posthog-js": "1.310.1",
+    "posthog-js": "1.311.0",
     "react": "19.2.3",
     "react-dom": "19.2.3",
     "react-medium-image-zoom": "5.4.0",