[wp-trac] [WordPress Trac] #56413: Update PHPMailer to 6.6.4

[WordPress Trac]

#56413: Update PHPMailer to 6.6.4
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 Reporter:  jrf               |      Owner:  (none)
     Type:  task (blessed)    |     Status:  new
 Priority:  normal            |  Milestone:  6.1
Component:  External          |    Version:  trunk
  Libraries                   |
 Severity:  normal            |   Keywords:  needs-patch add-to-field-guide
  Focuses:                    |
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 PHPMailer 6.6.4 has just been released. It's only a small release with
 minimal changes for WP.

 Full details:
 * https://github.com/PHPMailer/PHPMailer/releases/tag/v6.6.4
 * https://github.com/PHPMailer/PHPMailer/compare/v6.6.3...v6.6.4

 I've reviewed the diff and the changes look sensible to me, so I would
 recommend an update.

 Previously: #53430, #53953, #54514, #55187, #55277, #55976, #56016

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Ticket URL: <https://core.trac.wordpress.org/ticket/56413>
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