fix(deps): update dependency com.thoughtworks.xstream:xstream to v1.4.21

Author: renovate[bot]

bom/application/pom.xml

@@ -949,7 +949,7 @@
             <dependency>
                 <groupId>com.thoughtworks.xstream</groupId>
                 <artifactId>xstream</artifactId>
-                <version>1.4.20</version>
+                <version>1.4.21</version>
                 <exclusions>
                     <exclusion>
                         <groupId>xpp3</groupId>