[wp-trac] [WordPress Trac] #57554: Update to use PostCSS 8

[WordPress Trac]

#57554: Update to use PostCSS 8
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 Reporter:  desrosj           |      Owner:  desrosj
     Type:  enhancement       |     Status:  assigned
 Priority:  normal            |  Milestone:  6.2
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  has-patch
  Focuses:                    |
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 The CSS related build tooling currently uses PostCSS 6 or 7, depending on
 the dependency tree for each npm package. This ticket is to update these
 packages and the related tooling to use PostCSS 8.

 In addition to the Core build tools, Twenty Nineteen also uses an outdated
 version of PostCSS and should be updated.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57554>
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