Bump xstream from 1.4.5 to 1.4.6 in /kurento-parent-pom

Bumps xstream from 1.4.5 to 1.4.6.

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

kurento-parent-pom/pom.xml

@@ -788,7 +788,7 @@
 			<dependency>
 				<groupId>com.thoughtworks.xstream</groupId>
 				<artifactId>xstream</artifactId>
-				<version>1.4.5</version>
+				<version>1.4.6</version>
 			</dependency>
 			<dependency>
 				<groupId>org.codehaus.groovy</groupId>