Update to Spring Framework 4.3.23.BUILD-SNAPSHOT

Early access to schema validation feature

gradle/java.gradle

@@ -5,7 +5,7 @@ sourceCompatibility = '1.6'
 targetCompatibility = '1.6'
 
 ext.apacheDsVersion = '1.5.5'
-ext.springVersion = '4.3.4.RELEASE'
+ext.springVersion = '4.3.23.BUILD-SNAPSHOT'
 ext.springDataVersion = '1.12.11.RELEASE'
 ext.springDataSpring3Version = '1.10.2.RELEASE'
 ext.springBatchVersion = '2.0.4.RELEASE'

test/integration-tests-spring20/src/test/resources/conf/commonTestContext.xml

@@ -2,7 +2,7 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
-                           https://www.springframework.org/schema/beans/spring-beans.xsd">
+                           https://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
 
 	<!--
 		This context configuration file defines common beans,

test/integration-tests-spring20/src/test/resources/conf/ldapTemplateTestContext.xml

@@ -2,7 +2,7 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://www.springframework.org/schema/beans
-                           https://www.springframework.org/schema/beans/spring-beans.xsd">
+                           https://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
 	<import resource="classpath:/conf/commonTestContext.xml" />
 
 	<bean id="contextSource"