chore(deps): update nextra monorepo to v2.2.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nextra	2.2.7 -> 2.2.9
nextra-theme-docs	2.2.7 -> 2.2.9

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Release Notes

shuding/nextra

v2.2.9

Compare Source

Patch Changes

• c50474e: support dynamic markdown import

v2.2.8

Compare Source

Patch Changes

• d2ed10f: remove development: false
• b943146: add transformPageOpts option for advanced use cases

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