fixed a bug in /api/xml where unsafe chars were not escaped

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3296 71c3de6d-444a-0410-be80-ed276b4c234a

core/pom.xml

@@ -119,7 +119,7 @@
     <dependency>
       <groupId>org.kohsuke.stapler</groupId>
       <artifactId>stapler</artifactId>
-      <version>1.30</version>
+      <version>1.31</version>
     </dependency>
     <dependency>
       <groupId>org.kohsuke</groupId>