Merge pull request mitreid-connect#1357 from praseodym/spring-security-4.2.4

Upgrade to Spring Security 4.2.4

Author: jricher

pom.xml

@@ -386,7 +386,7 @@
 <dependency>
 <groupId>org.springframework.security</groupId>
 <artifactId>spring-security-bom</artifactId>
-<version>4.2.2.RELEASE</version>
+<version>4.2.4.RELEASE</version>
 <type>pom</type>
 <scope>import</scope>
 </dependency>