bump(deps): update dependency postcss to v8.4.34

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.33 -> 8.4.34

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Release Notes

postcss/postcss (postcss)

### [`v8.4.34`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8434) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.33...8.4.34) - Fixed `AtRule#nodes` type (by Tim Weißenfels). - Cleaned up code (by Dmitry Kirillov).

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