Upgrade to mysql-connector-java 5.1.38

Closes gh-4714

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -102,7 +102,7 @@
 		<logback.version>1.1.3</logback.version>
 		<mockito.version>1.10.19</mockito.version>
 		<mongodb.version>2.12.5</mongodb.version>
-		<mysql.version>5.1.36</mysql.version>
+		<mysql.version>5.1.38</mysql.version>
 		<reactor.version>1.1.6.RELEASE</reactor.version>
 		<reactor-spring.version>1.1.3.RELEASE</reactor-spring.version>
 		<servlet-api.version>3.1.0</servlet-api.version>