Update dependency postcss to v8.4.5

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.4 -> 8.4.5

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Release Notes

postcss/postcss

v8.4.5

Compare Source

• Fixed raws types to make object extendable (by James Garbutt).
• Moved from Yarn 1 to pnpm.

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