fix(deps): update dependency com.icegreen:greenmail to v1.6.11

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.icegreen:greenmail (source)	1.6.10 -> 1.6.11

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Release Notes

greenmail-mail-test/greenmail

### [`v1.6.11`](https://togithub.com/greenmail-mail-test/greenmail/compare/release-1.6.10...release-1.6.11) [Compare Source](https://togithub.com/greenmail-mail-test/greenmail/compare/release-1.6.10...release-1.6.11)

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