[wp-trac] [WordPress Trac] #50408: Update moment.js lib to its latest version

[WordPress Trac]

#50408: Update moment.js lib to its latest version
--------------------------------+-----------------------------
 Reporter:  yoancutillas        |      Owner:  (none)
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  External Libraries  |    Version:  5.4.2
 Severity:  normal              |   Keywords:
  Focuses:                      |
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 Hello,

 The core-bundled **momentjs library hasn't been updated in two years**
 (2.22.2 - Jun 1, 2018).

 JQMigrate displays a deprecation warning:

 {{{
 Deprecation warning: use moment.updateLocale(localeName, config) to change
 an existing locale. moment.defineLocale(localeName, config) should only be
 used for creating a new locale See http://momentjs.com/guides/#/warnings
 /define-locale/ for more info.
 }}}

 And some plugins and themes encounter **javascript fatal errors
 (blocking)** because of it:
 - https://wordpress.org/support/topic/cannot-edit-calendar-or-activities/
 - https://wordpress.org/support/topic/moment-js-integration-conflict/
 - https://wordpress.org/support/topic/minified-moment-js-library-causes-
 conflict-with-the-events-calendar-plugin/
 - https://wordpress.org/support/topic/calendar-not-loading-9/

 Is it possible to update momentjs to its latest version (currently 2.26.0
 - May 20, 2020)?

 {{{
 wp-includes\js\dist\vendor\moment.js
 wp-includes\js\dist\vendor\moment.min.js
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/50408>
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