Update struts2.version to v7.2.1 (#419)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -64,7 +64,7 @@
 
         <tlib.version>2.3</tlib.version>
         <!-- dependencies -->
-        <struts2.version>7.1.1</struts2.version>
+        <struts2.version>7.2.1</struts2.version>
         <log4j2.version>2.26.0</log4j2.version>
         <velocity.version>1.7</velocity.version>
         <freemarker.version>2.3.34</freemarker.version>