chore(deps): update fumadocs packages to v16.4.0 (#1042)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [fumadocs-core](https://fumadocs.dev)
([source](https://redirect.github.com/fuma-nama/fumadocs)) |
dependencies | minor | [`16.3.2` ->
`16.4.0`](https://renovatebot.com/diffs/npm/fumadocs-core/16.3.2/16.4.0)
| [![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/fuma-nama/fumadocs/badge)](https://securityscorecards.dev/viewer/?uri=github.com/fuma-nama/fumadocs)
|
| [fumadocs-ui](https://fumadocs.dev)
([source](https://redirect.github.com/fuma-nama/fumadocs)) |
dependencies | minor | [`16.3.2` ->
`16.4.0`](https://renovatebot.com/diffs/npm/fumadocs-ui/16.3.2/16.4.0) |
[![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/fuma-nama/fumadocs/badge)](https://securityscorecards.dev/viewer/?uri=github.com/fuma-nama/fumadocs)
|

---

### Release Notes

<details>
<summary>fuma-nama/fumadocs (fumadocs-core)</summary>

###
[`v16.4.0`](https://redirect.github.com/fuma-nama/fumadocs/releases/tag/fumadocs-core%4016.4.0)

[Compare
Source](https://redirect.github.com/fuma-nama/fumadocs/compare/fumadocs-core@16.3.2...fumadocs-core@16.4.0)

##### Minor Changes

-
[`a3b7919`](https://redirect.github.com/fuma-nama/fumadocs/commit/a3b7919):
Update mixedbread integration API and docs

</details>

---

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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Upgraded fumadocs-core and fumadocs-ui to v16.4.0 to keep our docs
tooling current and pull in the latest integration updates. No app code
changes.

- **Dependencies**
  - fumadocs-core: 16.3.2 → 16.4.0
  - fumadocs-ui: 16.3.2 → 16.4.0

- **Migration**
- If you use the mixedbread integration, update @mixedbread/sdk to
^0.46.0 and adapt to the new API.

<sup>Written for commit 9a9f91a.
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

@@ -34,10 +34,10 @@
     "@settlemint/sdk-viem": "2.6.4",
     "ai": "5.0.116",
     "class-variance-authority": "0.7.1",
-    "fumadocs-core": "16.3.2",
+    "fumadocs-core": "16.4.0",
     "fumadocs-mdx": "13.0.8",
     "fumadocs-typescript": "4.0.14",
-    "fumadocs-ui": "16.3.2",
+    "fumadocs-ui": "16.4.0",
     "hast-util-to-jsx-runtime": "2.3.6",
     "lucide-react": "0.562.0",
     "mermaid": "11.12.2",