Update dependency org.jasig.portlet:uportal-portlet-parent to v51

Author: renovate[bot]

pom.xml

@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.jasig.portlet</groupId>
     <artifactId>uportal-portlet-parent</artifactId>
-    <version>50</version>
+    <version>51</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>