fix(deps): update nextra monorepo to ^3.0.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nextra	^3.0.3 -> ^3.0.4
nextra-theme-docs	^3.0.3 -> ^3.0.4

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Release Notes

shuding/nextra (nextra)

v3.0.4

Compare Source

Patch Changes

• 84a8a41: use 3 nextra's webpack loaders instead of 4
• 659b36e: remove jsx-runtime.cjs, import runtime from 'react/jsx-runtime'
• 84fc255: should get right activeType, activeThemeContext even when some
  parent has display: 'hidden'

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