Update hibernate-entitymanager to 5.6.8.Final

Closes gh-11149

dependencies/spring-security-dependencies.gradle

@@ -54,7 +54,7 @@ dependencies {
 		api "org.eclipse.jetty:jetty-servlet:9.4.46.v20220331"
 		api "org.eclipse.persistence:javax.persistence:2.2.1"
 		api "org.hamcrest:hamcrest:2.2"
-		api "org.hibernate:hibernate-entitymanager:5.6.7.Final"
+		api "org.hibernate:hibernate-entitymanager:5.6.8.Final"
 		api "org.hsqldb:hsqldb:2.6.1"
 		api "org.jasig.cas.client:cas-client-core:3.6.4"
 		api "org.mockito:mockito-core:3.12.4"