Bump MailKit from 2.1.0.1 to 2.1.3 in /src/Miningcore (#549)
Bump MailKit from 2.1.0.1 to 2.1.3 in /src/Miningcore (#549)

Bumps [MailKit](https://github.com/jstedfast/MailKit) from 2.1.0.1 to 2.1.3.
- [Release notes](https://github.com/jstedfast/MailKit/releases)
- [Changelog](https://github.com/jstedfast/MailKit/blob/master/ReleaseNotes.md)
- [Commits](https://github.com/jstedfast/MailKit/commits/2.1.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
coinfoundry/miningcore,coinfoundry/miningcore,coinfoundry/miningcore,coinfoundry/miningcore