chore(deps): update dependency postcss to ^8.4.18

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.4.16 -> ^8.4.18

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Release Notes

postcss/postcss

v8.4.18

Compare Source

• Fixed an error on absolute: true with empty sourceContent (by Rene Haas).

v8.4.17

Compare Source

• Fixed Node.before() unexpected behavior (by Romain Menke).
• Added TOC to docs (by Mikhail Dedov).

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Configuration

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Latest commit: be04779998239a8c113c75a8974080dbb5cb9ade

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