chore(deps): update dependency postcss to v8.5.3

This MR contains the following updates:

Package	Type	Update	Change
postcss (source)	devDependencies	patch	8.5.2 -> 8.5.3

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Release Notes

postcss/postcss (postcss)

v8.5.3

Compare Source

• Added more details to Unknown word error (by @​hiepxanh).
• Fixed types (by @​romainmenke).
• Fixed docs (by @​catnipan).

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