Bump struts2-core from 2.3.15.1 to 2.5.30 in /Struts2HelloWorldPortlet

Bumps [struts2-core](https://github.com/apache/struts) from 2.3.15.1 to 2.5.30.
- [Release notes](https://github.com/apache/struts/releases)
- [Commits](https://github.com/apache/struts/commits)

---
updated-dependencies:
- dependency-name: org.apache.struts:struts2-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/Struts2HelloWorldPortlet/pom.xml b/Struts2HelloWorldPortlet/pom.xml
index 7fc3184..332da48 100644
--- a/Struts2HelloWorldPortlet/pom.xml
+++ b/Struts2HelloWorldPortlet/pom.xml
@@ -24,7 +24,7 @@
 		<dependency>
 			<groupId>org.apache.struts</groupId>
 			<artifactId>struts2-core</artifactId>
-			<version>2.3.15.1</version>
+			<version>2.5.30</version>
 		</dependency>