Upgrade to Mariadb 2.2.5

Closes gh-13396

Author: wilkinsona

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

@@ -121,7 +121,7 @@
 		<log4j2.version>2.10.0</log4j2.version>
 		<logback.version>1.2.3</logback.version>
 		<lombok.version>1.16.22</lombok.version>
-		<mariadb.version>2.2.3</mariadb.version>
+		<mariadb.version>2.2.5</mariadb.version>
 		<micrometer.version>1.0.4</micrometer.version>
 		<mockito.version>2.15.0</mockito.version>
 		<mongo-driver-reactivestreams.version>1.7.1</mongo-driver-reactivestreams.version>