Upgrade to Ehcache 3.1.2

Closes gh-6922

Author: snicoll

spring-boot-dependencies/pom.xml

@@ -69,7 +69,7 @@
 		<dom4j.version>1.6.1</dom4j.version>
 		<dropwizard-metrics.version>3.1.2</dropwizard-metrics.version>
 		<ehcache.version>2.10.2.2.21</ehcache.version>
-		<ehcache3.version>3.1.1</ehcache3.version>
+		<ehcache3.version>3.1.2</ehcache3.version>
 		<embedded-mongo.version>1.50.5</embedded-mongo.version>
 		<flyway.version>3.2.1</flyway.version>
 		<freemarker.version>2.3.25-incubating</freemarker.version>