Bump vaadin-server from 7.7.3 to 7.7.24 in /rdfunit-webdemo

Bumps vaadin-server from 7.7.3 to 7.7.24.

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

Author: dependabot[bot]

rdfunit-webdemo/pom.xml

@@ -14,7 +14,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <vaadin.version>7.7.3</vaadin.version>
+    <vaadin.version>7.7.24</vaadin.version>
   </properties>
   <repositories>
     <repository>