Bump phpmailer/phpmailer from 6.1.8 to 6.4.1
Bump phpmailer/phpmailer from 6.1.8 to 6.4.1

Bumps [phpmailer/phpmailer](https://github.com/PHPMailer/PHPMailer) from 6.1.8 to 6.4.1.
- [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/v6.1.8...v6.4.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
decke/nodeman,decke/nodeman,decke/nodeman,decke/nodeman