chore(deps): update fumadocs packages to v15.6.12 (#666)

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 | [`15.6.11` ->
`15.6.12`](https://renovatebot.com/diffs/npm/fumadocs-core/15.6.11/15.6.12)
| [![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 | [`15.6.11` ->
`15.6.12`](https://renovatebot.com/diffs/npm/fumadocs-ui/15.6.11/15.6.12)
| [![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>

###
[`v15.6.12`](https://redirect.github.com/fuma-nama/fumadocs/compare/fumadocs-core@15.6.11...fumadocs-core@15.6.12)

[Compare
Source](https://redirect.github.com/fuma-nama/fumadocs/compare/fumadocs-core@15.6.11...fumadocs-core@15.6.12)

</details>

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