[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            |  Resolution:
 Keywords:  has-patch         |     Focuses:
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Comment (by desrosj):

 Sorry @peterwilsoncc, I missed the props in [55150] but I've gone and
 added it manually.

 [55150] solves the update in Core build tools, but there's still some
 investigation needed into the resulting CSS changes in Twenty Nineteen.
 The PR has been updated to only include the Twenty Nineteen changes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57554#comment:4>
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