[RHPAM-4637] Bump xstream to 1.4.20 (#2944)

Author: rgdoliveira

build/optaplanner-build-parent/pom.xml

@@ -24,7 +24,7 @@
 
     <!-- Normal dependency versions -->
     <version.ch.qos.logback>1.2.10</version.ch.qos.logback>
-    <version.com.thoughtworks.xstream>1.4.19</version.com.thoughtworks.xstream>
+    <version.com.thoughtworks.xstream>1.4.20</version.com.thoughtworks.xstream>
     <version.io.quarkus>2.13.8.Final</version.io.quarkus>
     <version.org.apache.commons.math3>3.6.1</version.org.apache.commons.math3>
     <version.org.apache.commons.text>1.10.0</version.org.apache.commons.text>