fix(deps): update dependency com.icegreen:greenmail-junit4 to v2.1.1 (main)

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.icegreen:greenmail-junit4 (source)	2.1.0 -> 2.1.1

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Release Notes

greenmail-mail-test/greenmail (com.icegreen:greenmail-junit4)

### [`v2.1.1`](https://redirect.github.com/greenmail-mail-test/greenmail/compare/release-2.1.0...release-2.1.1) [Compare Source](https://redirect.github.com/greenmail-mail-test/greenmail/compare/release-2.1.0...release-2.1.1)

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