Upgrade to Hibernate 5.3.15.Final

Closes gh-19729

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -71,7 +71,7 @@
 		<hamcrest.version>1.3</hamcrest.version>
 		<hazelcast.version>3.11.6</hazelcast.version>
 		<hazelcast-hibernate5.version>1.2.3</hazelcast-hibernate5.version>
-		<hibernate.version>5.3.14.Final</hibernate.version>
+		<hibernate.version>5.3.15.Final</hibernate.version>
 		<hibernate-validator.version>6.0.18.Final</hibernate-validator.version>
 		<hikaricp.version>3.2.0</hikaricp.version>
 		<hsqldb.version>2.4.1</hsqldb.version>