Upgrade to MySQL Java Connector 5.1.39

Closes gh-5946

spring-boot-dependencies/pom.xml

@@ -116,7 +116,7 @@
 		<mariadb.version>1.2.3</mariadb.version>
 		<mockito.version>1.10.19</mockito.version>
 		<mongodb.version>2.13.3</mongodb.version>
-		<mysql.version>5.1.38</mysql.version>
+		<mysql.version>5.1.39</mysql.version>
 		<nekohtml.version>1.9.22</nekohtml.version>
 		<postgresql.version>9.4.1208.jre7</postgresql.version>
 		<reactor.version>2.0.8.RELEASE</reactor.version>