chore(deps): update dependency postcss to v8.4.16

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.14 -> 8.4.16

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Release Notes

postcss/postcss

v8.4.16

Compare Source

• Fixed Root AST migration.

v8.4.15

Compare Source

• Fixed AST normalization after using custom parser with old PostCSS AST.

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