Upgrade to Spring Security 4.2.12

Closes gh-16352

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>1.2.4.RELEASE</spring-retry.version>
-		<spring-security.version>4.2.12.BUILD-SNAPSHOT</spring-security.version>
+		<spring-security.version>4.2.12.RELEASE</spring-security.version>
 		<spring-security-jwt.version>1.0.10.RELEASE</spring-security-jwt.version>
 		<spring-security-oauth.version>2.0.17.RELEASE</spring-security-oauth.version>
 		<spring-session.version>1.3.5.RELEASE</spring-session.version>