fix(deps): update dependency postcss-nested to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-nested	^5.0.6 -> ^6.2.0

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

postcss/postcss-nested (postcss-nested)

v6.2.0

Compare Source

• Added @starting-style to bubbling at-rules.

v6.0.1

Compare Source

• Added @container to bubbling at-rules.

v6.0.0

Compare Source

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