Bump com.icegreen:greenmail from 2.1.8 to 2.1.9 (#1426)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -1445,7 +1445,7 @@ under the License.
       <dependency>
         <groupId>com.icegreen</groupId>
         <artifactId>greenmail</artifactId>
-        <version>2.1.8</version>
+        <version>2.1.9</version>
         <exclusions>
           <exclusion>
             <groupId>com.sun.mail</groupId>