changed spring version

pom.xml

@@ -12,7 +12,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <sonar.host.url>https://ci.bibforge.org/sonar</sonar.host.url>
     <cxf.version>2.7.13</cxf.version>
-    <spring.version>3.1.2.RELEASE</spring.version>
+    <spring.version>4.0.2.RELEASE</spring.version>
     <textgrid.httpclients.version>1.3.0-SNAPSHOT</textgrid.httpclients.version>
     <felix.version>2.3.4</felix.version>
     <jetty.version>6.1.15</jetty.version>