Bump phpmailer/phpmailer from 6.1.5 to 6.1.6 in /platform
Bump phpmailer/phpmailer from 6.1.5 to 6.1.6 in /platform

Bumps [phpmailer/phpmailer](https://github.com/PHPMailer/PHPMailer) from 6.1.5 to 6.1.6.
- [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/v6.1.5...v6.1.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ivantcholakov/starter-public-edition-4,ivantcholakov/starter-public-edition-4,ivantcholakov/starter-public-edition-4,ivantcholakov/starter-public-edition-4