Bump xstream from 1.4.11 to 1.4.12 (#53)

* Bump xstream from 1.4.11 to 1.4.12-java7

Bumps [xstream](https://github.com/x-stream/xstream) from 1.4.11 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] <support@dependabot.com>

* Upgrade xstream to 1.4.12

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Mincong HUANG <mincong.h@gmail.com>

Author: dependabot-preview[bot]

pom.xml

@@ -45,7 +45,7 @@
     <slf4jVersion>1.7.25</slf4jVersion>
     <vavrVersion>1.0.0-alpha-3</vavrVersion>
     <xercesVersion>2.12.0</xercesVersion>
-    <xstreamVersion>1.4.11</xstreamVersion>
+    <xstreamVersion>1.4.12</xstreamVersion>
   </properties>
 
   <modules>