Bump greenmail from 1.6.1 to 1.6.2

Bumps [greenmail](https://github.com/greenmail-mail-test/greenmail) from 1.6.1 to 1.6.2.
- [Release notes](https://github.com/greenmail-mail-test/greenmail/releases)
- [Commits](https://github.com/greenmail-mail-test/greenmail/compare/release-1.6.1...release-1.6.2)

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