Update dependency phpmailer/phpmailer to v6.5.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
phpmailer/phpmailer	require	patch	6.5.3 -> 6.5.4

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Release Notes

PHPMailer/PHPMailer

v6.5.4

Compare Source

• If we can't use escaping functions, refuse to do unsafe things
• Avoid PHP 8.1 trim issue
• Add tests for XMailer
• Fix bug in use of CharSet property
• Fix bug in file upload example
• Update dev dependencies

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