Upgrade to xstream 1.4.19.

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:development
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Closes: #2259

Author: dependabot[bot]

pom.xml

@@ -19,7 +19,7 @@
 		<springdata.keyvalue>3.0.0-SNAPSHOT</springdata.keyvalue>
 		<awaitility>4.0.2</awaitility>
 		<beanutils>1.9.4</beanutils>
-		<xstream>1.4.18</xstream>
+		<xstream>1.4.19</xstream>
 		<pool>2.9.0</pool>
 		<lettuce>6.1.6.RELEASE</lettuce>
 		<jedis>3.8.0</jedis>