Bump greenmail.version from 2.1.5 to 2.1.6

Bumps `greenmail.version` from 2.1.5 to 2.1.6.

Updates `com.icegreen:greenmail-junit4` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/greenmail-mail-test/greenmail/releases)
- [Commits](greenmail-mail-test/greenmail@release-2.1.5...release-2.1.6)

Updates `com.icegreen:greenmail` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/greenmail-mail-test/greenmail/releases)
- [Commits](greenmail-mail-test/greenmail@release-2.1.5...release-2.1.6)

---
updated-dependencies:
- dependency-name: com.icegreen:greenmail-junit4
  dependency-version: 2.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: com.icegreen:greenmail
  dependency-version: 2.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

extensions/modules/mail/pom.xml

@@ -49,7 +49,7 @@
         <jakarta.mail-api.version>2.1.5</jakarta.mail-api.version>
         <eclipse.angus-mail.version>2.0.5</eclipse.angus-mail.version>
         <jakarta.activation-api.version>2.1.4</jakarta.activation-api.version>
-        <greenmail.version>2.1.5</greenmail.version>
+        <greenmail.version>2.1.6</greenmail.version>
     </properties>
 
     <dependencies>