Bump xstream from 1.4.12 to 1.4.12-java7

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.12 to 1.4.12-java7.
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

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

Author: dependabot-preview[bot]

xml/pom.xml

@@ -15,7 +15,7 @@
 
   <properties>
     <xerces.version>2.12.0</xerces.version>
-    <xstream.version>1.4.12</xstream.version>
+    <xstream.version>1.4.12-java7</xstream.version>
   </properties>
 
   <dependencies>