Update dependency phpmailer/phpmailer to v6.5.3

This MR contains the following updates:

Package	Type	Update	Change
phpmailer/phpmailer	require	patch	6.5.1 -> 6.5.3

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Release Notes

PHPMailer/PHPMailer

v6.5.3

Compare Source

• Wrong commit tagged for the 6.5.2 release!
• Version file updated

v6.5.2

Compare Source

• Enable official support for PHP 8.1
• Enable experimental support for PHP 8.2
• Fix for PHP 5.6
• Fix for incorrect options for punyencoding IDNs

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