Do not upgrade to greenmail-junit5 2.x in examples project.

Author: devopsix

examples/pom.xml

@@ -58,7 +58,7 @@
     <dependency>
       <groupId>com.icegreen</groupId>
       <artifactId>greenmail-junit5</artifactId>
-      <version>2.1.2</version>
+      <version>1.6.15</version>
       <scope>test</scope>
     </dependency>
     <dependency>