Bump pkgVersion from 1.3 to 1.4.20 in /xstream-1.3

Bumps `pkgVersion` from 1.3 to 1.4.20.

Updates `xstream` from 1.3 to 1.4.20
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

Updates `xstream` from 1.3 to 1.4.20
- [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
- dependency-name: com.thoughtworks.xstream:xstream:sources
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/xstream-1.3/pom.xml b/xstream-1.3/pom.xml
index a9063ca..d9c009c 100644
--- a/xstream-1.3/pom.xml
+++ b/xstream-1.3/pom.xml
@@ -38,7 +38,7 @@
     <properties>
         <pkgGroupId>com.thoughtworks.xstream</pkgGroupId>
         <pkgArtifactId>xstream</pkgArtifactId>
-        <pkgVersion>1.3</pkgVersion>
+        <pkgVersion>1.4.20</pkgVersion>
         <servicemix.osgi.export.pkg>
             com.thoughtworks.xstream
         </servicemix.osgi.export.pkg>