fix(deps): update uportal-libs.version to v5.15.1

Author: renovate[bot]

pom.xml

@@ -64,7 +64,7 @@
         <slf4jVersion>2.0.6</slf4jVersion>
         <mockito.version>4.9.0</mockito.version>
         <portlet.mvc.util.version>1.1.3</portlet.mvc.util.version>
-        <uportal-libs.version>5.12.0</uportal-libs.version>
+        <uportal-libs.version>5.15.1</uportal-libs.version>
     </properties>
 
     <dependencyManagement>