Upgrade Mock JavaMail (#355)

Author: basil

pom.xml

@@ -159,9 +159,9 @@
             <scope>test</scope>
         </dependency>
         <dependency>
-            <groupId>org.jvnet.mock-javamail</groupId>
+            <groupId>io.jenkins.lib</groupId>
             <artifactId>mock-javamail</artifactId>
-            <version>2.2</version>
+            <version>2.3</version>
             <scope>test</scope>
             <exclusions>
                 <!-- Provided by jakarta-activation-api plugin -->