fix(deps): update dependency postcss to ^8.5.4 (spectrum-two)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.5.3 -> ^8.5.4

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Release Notes

postcss/postcss (postcss)

v8.5.4

Compare Source

• Fixed Parcel compatibility issue (by @​git-sumitchaudhary).

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Latest commit: e4b3f01

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File metrics

Summary

Total size: 1.42 MB^*

🎉 No changes detected in any packages

* Size is the sum of all main files for packages in the library.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[cdransf]

No regressions observed. ✨