⬆️ Bump xstream from 1.4.14 to 1.4.15 (#1932)

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.14 to 1.4.15.
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -177,7 +177,7 @@
       <dependency>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId>
-        <version>1.4.14</version>
+        <version>1.4.15</version>
       </dependency>
       <dependency>
         <groupId>com.google.guava</groupId>