Merge pull request #1410 from awsdocs/dependabot/maven/java/example_code/iam/junit-junit-4.13.1

Bump junit from 3.8.1 to 4.13.1 in /java/example_code/iam

Author: brmur

java/example_code/iam/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>3.8.1</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>