[wp-meta] [Making WordPress.org] #5363: Upgrade Markdown library

[Making WordPress.org]

#5363: Upgrade Markdown library
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 Reporter:  dd32              |      Owner:  (none)
     Type:  defect            |     Status:  new
 Priority:  low               |  Milestone:
Component:  Plugin Directory  |   Keywords:  needs-testing
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 We're currently using [https://github.com/michelf/php-markdown michelf
 /php-markdown 1.6] and the latest version if 1.9.

 As seen in https://github.com/WordPress/wordpress.org/pull/16 it's using
 PHP 7.4 deprecated curly bracket syntax, which is
 [https://github.com/michelf/php-
 markdown/commit/a35858f0409e5f01474f5cd562d17289fe8e5435#diff-
 8e95e3657c7e2d073d1d898e1c9239c6 fixed in v1.9.

 Marking as low as I'm just going to commit the backported patch from
 xknown for now.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/5363>
Making WordPress.org <https://meta.trac.wordpress.org/>
Making WordPress.org