:arrow_up: Bump xstream from 1.4.18 to 1.4.19 (#2525)

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.18 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
...

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pom.xml

@@ -175,7 +175,7 @@
       <dependency>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId>
-        <version>1.4.18</version>
+        <version>1.4.19</version>
       </dependency>
       <dependency>
         <groupId>com.google.guava</groupId>