Bump versions of Spring XSDs

src/main/webapp/WEB-INF/spring/arsnova-servlet.xml

@@ -6,10 +6,10 @@
 	xmlns:mvc="http://www.springframework.org/schema/mvc"
 	xmlns:p="http://www.springframework.org/schema/p"
 	xsi:schemaLocation="
-		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
-		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
+		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
+		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
+		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
+		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
 
 	<!-- ARSnova Servlet Context -->
 

src/main/webapp/WEB-INF/spring/spring-main.xml

@@ -6,10 +6,10 @@
 	xmlns:task="http://www.springframework.org/schema/task"
 	xmlns:p="http://www.springframework.org/schema/p"
 	xsi:schemaLocation="
-		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
-		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
-		http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.2.xsd">
+		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
+		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
+		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
+		http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd">
 
 	<bean id="propertyPlaceholderConfigurer"
 		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"