Update to Spring 4.3.1

Fixes gh-3963

build.gradle

@@ -27,7 +27,7 @@ allprojects {
 
 	ext.releaseBuild = version.endsWith('RELEASE')
 	ext.snapshotBuild = version.endsWith('SNAPSHOT')
-	ext.springVersion = '4.3.1.BUILD-SNAPSHOT'
+	ext.springVersion = '4.3.1.RELEASE'
 	ext.springLdapVersion = '2.0.2.RELEASE'
 
 	group = 'org.springframework.security'

core/src/main/java/org/springframework/security/core/SpringSecurityCoreVersion.java

@@ -40,7 +40,7 @@ public class SpringSecurityCoreVersion {
 	 */
 	public static final long SERIAL_VERSION_UID = 410L;
 
-	static final String MIN_SPRING_VERSION = "4.3.1.BUILD-SNAPSHOT";
+	static final String MIN_SPRING_VERSION = "4.3.1.RELEASE";
 
 	static {
 		performVersionChecks();