chore(deps): update dependency unified to ^9.2.0

[wardpeet]

This PR contains the following updates:

Package	Type	Update	Change
unified (source)	devDependencies	minor	^9.0.0 -> ^9.2.0

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Release Notes

unifiedjs/unified

### [`v9.2.0`](https://togithub.com/unifiedjs/unified/releases/9.2.0) [Compare Source](https://togithub.com/unifiedjs/unified/compare/9.1.0...9.2.0) - [`7fc4271`](https://togithub.com/unifiedjs/unified/commit/7fc4271) Add variadic tuple types for plugin tuple ### [`v9.1.0`](https://togithub.com/unifiedjs/unified/releases/9.1.0) [Compare Source](https://togithub.com/unifiedjs/unified/compare/9.0.0...9.1.0) - [`56fdba4`](https://togithub.com/unifiedjs/unified/commit/56fdba4) Add `FrozenProcessor` interface to types

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