Bump postcss to ^8.5.4

[renovate[bot]]

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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Bundle size report

Total Size Change: 0B^(0.00%) - Total Gzip Change:^{${\tiny{\color{green}▼}}$}-3B^(0.00%) Files: 120 total (0 added, 0 removed, 10 changed)

Show 10 more bundle changes

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Details of bundle changes

Generated by :no_entry_sign: dangerJS against 4514df209eba4b28ed4fb0ae5d26f2b7c8e18567