Merge pull request #282 from kekingcn/dependabot/maven/server/com.thoughtworks.xstream-xstream-1.4.18

Bump xstream from 1.4.17 to 1.4.18 in /server

server/pom.xml

@@ -149,7 +149,7 @@
         <dependency>
             <groupId>com.thoughtworks.xstream</groupId>
             <artifactId>xstream</artifactId>
-            <version>1.4.17</version>
+            <version>1.4.18</version>
         </dependency>
         <dependency>
             <groupId>com.googlecode.concurrentlinkedhashmap</groupId>