chore: bump parent v49 -> v50 for plexus-archiver CVE fix (#349)

uportal-portlet-parent:50 patches CVE-2023-37460 (plexus-archiver
Arbitrary File Creation in AbstractUnArchiver, CVSS 8.1 HIGH) by
bumping maven-war-plugin 3.4.0 -> 3.5.1, which bundles the patched
plexus-archiver 4.10.4. Real-world risk for portlet builds is low
(we create WARs, the CVE is in the unarchive path) but the parent
shouldn't ship a known-vulnerable transitive by default.

Changes:
- pom.xml: <parent><version>49</version></> -> <version>50</version>.

Author: bjagg

pom.xml

@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.jasig.portlet</groupId>
     <artifactId>uportal-portlet-parent</artifactId>
-    <version>49</version>
+    <version>50</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>