fix(deps): update greenmail monorepo to v2.1.0 (main)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.icegreen:greenmail-junit5 (source)	2.0.1 -> 2.1.0
com.icegreen:greenmail-junit4 (source)	2.0.1 -> 2.1.0

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Release Notes

greenmail-mail-test/greenmail (com.icegreen:greenmail-junit5)

### [`v2.1.0`](https://redirect.github.com/greenmail-mail-test/greenmail/compare/release-2.0.1...release-2.1.0) [Compare Source](https://redirect.github.com/greenmail-mail-test/greenmail/compare/release-2.0.1...release-2.1.0)

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