Update to Spring 4.3.12

Fixes gh-4776

itest/context/pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.springframework.security</groupId>
   <artifactId>itest-context</artifactId>
-  <version>4.2.3.RELEASE</version>
+  <version>4.2.4.BUILD-SNAPSHOT</version>
   <name>itest-context</name>
   <description>itest-context</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>
@@ -57,7 +57,7 @@
     <dependency>
       <groupId>org.springframework.security</groupId>
       <artifactId>spring-security-core</artifactId>
-      <version>4.2.3.RELEASE</version>
+      <version>4.2.4.BUILD-SNAPSHOT</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
@@ -132,13 +132,13 @@
     <dependency>
       <groupId>org.springframework.security</groupId>
       <artifactId>spring-security-config</artifactId>
-      <version>4.2.3.RELEASE</version>
+      <version>4.2.4.BUILD-SNAPSHOT</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.springframework.security</groupId>
       <artifactId>spring-security-web</artifactId>
-      <version>4.2.3.RELEASE</version>
+      <version>4.2.4.BUILD-SNAPSHOT</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -152,6 +152,12 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+  <repositories>
+    <repository>
+      <id>spring-snapshot</id>
+      <url>https://repo.spring.io/snapshot</url>
+    </repository>
+  </repositories>
   <build>
     <plugins>
       <plugin>