Upgrade to Spring Security 4.2.9.RELEASE

Closes gh-14848

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -168,7 +168,7 @@
 		<spring-plugin.version>1.2.0.RELEASE</spring-plugin.version>
 		<spring-restdocs.version>1.1.3.RELEASE</spring-restdocs.version>
 		<spring-retry.version>1.2.2.RELEASE</spring-retry.version>
-		<spring-security.version>4.2.8.RELEASE</spring-security.version>
+		<spring-security.version>4.2.9.RELEASE</spring-security.version>
 		<spring-security-jwt.version>1.0.9.RELEASE</spring-security-jwt.version>
 		<spring-security-oauth.version>2.0.16.RELEASE</spring-security-oauth.version>
 		<spring-session.version>1.3.3.RELEASE</spring-session.version>