fix(deps): update fumadocs

[renovate]

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This PR contains the following updates:

Package	Change	Age	Confidence
fumadocs-core (source)	15.8.3 -> 15.8.4
fumadocs-mdx (source)	12.0.2 -> 12.0.3
fumadocs-ui (source)	15.8.3 -> 15.8.4

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Release Notes

fuma-nama/fumadocs (fumadocs-core)

v15.8.4

Compare Source

Patch Changes

• ce2be59: Loader Plugin: support name & config options
• 31b9494: Support multiple() for multiple sources in same loader()

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