[wp-trac] [WordPress Trac] #53953: Update PHPMailer to 6.5.1

[WordPress Trac]

#53953: Update PHPMailer to 6.5.1
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 Reporter:  jrf                 |      Owner:  (none)
     Type:  task (blessed)      |     Status:  new
 Priority:  normal              |  Milestone:  5.9
Component:  External Libraries  |    Version:
 Severity:  normal              |   Keywords:  needs-patch
  Focuses:                      |
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 PHPMailer 6.5.1 has just been released and includes preliminary PHP 8.1
 support, as well as some small bugfixes.

 The version included with WP should be updated.

 Full details:
 * https://github.com/PHPMailer/PHPMailer/releases/tag/v6.5.1
 * https://github.com/PHPMailer/PHPMailer/compare/v6.5.0...v6.5.1 (note:
 this diff is massive, but most changes are in the test suite)


 I've reviewed the (code, not test) diff and would strongly recommend an
 update at the earliest convenience. Second opinion appreciated though as I
 ''made'' a significant number of the code changes, so I'm biased. 😁

 Previously: #53430
 Related: #53635

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Ticket URL: <https://core.trac.wordpress.org/ticket/53953>
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