[Security] Bump phpmailer/phpmailer from 6.4.1 to 6.5.0 (#1472)

Bumps [phpmailer/phpmailer](https://github.com/PHPMailer/PHPMailer) from 6.4.1 to 6.5.0. **This update includes security fixes.**
- [Release notes](https://github.com/PHPMailer/PHPMailer/releases)
- [Changelog](https://github.com/PHPMailer/PHPMailer/blob/master/changelog.md)
- [Commits](https://github.com/PHPMailer/PHPMailer/compare/v6.4.1...v6.5.0

)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>