chore(deps): update dependency postcss-nested to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-nested	^6.0.0 -> ^7.0.0

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Release Notes

postcss/postcss-nested (postcss-nested)

v7.0.0

Compare Source

• More complex logic of when to move comments (by @​Ulyanov-programmer).
• Removed Node.js 16, 14, and 12 support.

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