chore(deps): update fumadocs packages to v15.6.4 (#599)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [fumadocs-core](https://fumadocs.vercel.app)
([source](https://redirect.github.com/fuma-nama/fumadocs)) |
dependencies | patch | [`15.6.3` ->
`15.6.4`](https://renovatebot.com/diffs/npm/fumadocs-core/15.6.3/15.6.4)
| [![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.vercel.app)
([source](https://redirect.github.com/fuma-nama/fumadocs)) |
dependencies | patch | [`15.6.3` ->
`15.6.4`](https://renovatebot.com/diffs/npm/fumadocs-ui/15.6.3/15.6.4) |
[![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>

###
[`v15.6.4`](https://redirect.github.com/fuma-nama/fumadocs/releases/tag/fumadocs-ui%4015.6.4)

[Compare
Source](https://redirect.github.com/fuma-nama/fumadocs/compare/fumadocs-core@15.6.3...fumadocs-core@15.6.4)

##### Patch Changes

-
[`dca17d7`](https://redirect.github.com/fuma-nama/fumadocs/commit/dca17d7):
Improve search dialog consistency
  - fumadocs-core@15.6.4

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At 12:00 AM through 04:59 AM and 10:00
PM through 11:59 PM, Monday through Friday ( * 0-4,22-23 * * 1-5 ), Only
on Sunday and Saturday ( * * * * 0,6 ) (UTC), Automerge - At any time
(no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these
updates again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/settlemint/docs).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4yMy4yIiwidXBkYXRlZEluVmVyIjoiNDEuMjMuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiZGVwZW5kZW5jaWVzIl19-->

## Summary by Sourcery

Chores:
- Bump fumadocs-core and fumadocs-ui to v15.6.4

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

@@ -31,11 +31,11 @@
     "class-variance-authority": "0.7.1",
     "clsx": "2.1.1",
     "fast-glob": "3.3.3",
-    "fumadocs-core": "15.6.3",
+    "fumadocs-core": "15.6.4",
     "fumadocs-docgen": "2.1.0",
     "fumadocs-mdx": "11.6.11",
     "fumadocs-twoslash": "3.1.4",
-    "fumadocs-ui": "15.6.3",
+    "fumadocs-ui": "15.6.4",
     "gray-matter": "4.0.3",
     "lucide-react": "0.525.0",
     "next": "15.4.1",