Update struts2-jquery-plugin.version to v6.1.0 (#420)

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

Author: renovate[bot]

struts2-bootstrap-showcase/pom.xml

@@ -13,7 +13,7 @@
     <packaging>war</packaging>
 
     <properties>
-        <struts2-jquery-plugin.version>6.0.3</struts2-jquery-plugin.version>
+        <struts2-jquery-plugin.version>6.1.0</struts2-jquery-plugin.version>
         <jetty-maven-plugin.version>11.0.26</jetty-maven-plugin.version>
     </properties>