Bump xstream from 1.4.11 to 1.4.19 in /parent

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.11 to 1.4.19.
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

---
updated-dependencies:
- dependency-name: com.thoughtworks.xstream:xstream
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/parent/pom.xml b/parent/pom.xml
index 744f0c2..ac628be 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -159,7 +159,7 @@
                         <dependency>
                             <groupId>com.thoughtworks.xstream</groupId>
                             <artifactId>xstream</artifactId>
-                            <version>1.4.11</version>
+                            <version>1.4.19</version>
                         </dependency>
                     </dependencies>
                 </plugin>