Update to Spring 4.3.12

Fixes gh-4776

core/pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.security</groupId>
   <artifactId>spring-security-core</artifactId>
-  <version>4.2.3.RELEASE</version>
+  <version>4.2.4.BUILD-SNAPSHOT</version>
   <name>spring-security-core</name>
   <description>spring-security-core</description>
   <url>http://spring.io/spring-security</url>
@@ -35,7 +35,7 @@
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-framework-bom</artifactId>
-        <version>4.3.9.RELEASE</version>
+        <version>4.3.12.RELEASE</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -294,6 +294,12 @@
       </exclusions>
     </dependency>
   </dependencies>
+  <repositories>
+    <repository>
+      <id>spring-snapshot</id>
+      <url>https://repo.spring.io/snapshot</url>
+    </repository>
+  </repositories>
   <build>
     <plugins>
       <plugin>

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

@@ -40,7 +40,7 @@ public class SpringSecurityCoreVersion {
 	 */
 	public static final long SERIAL_VERSION_UID = 420L;
 
-	static final String MIN_SPRING_VERSION = "4.3.9.RELEASE";
+	static final String MIN_SPRING_VERSION = "4.3.12.RELEASE";
 
 	static {
 		performVersionChecks();