Upgrade to Mariadb 2.2.0

Closes gh-10999

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

@@ -111,7 +111,7 @@
 		<log4j2.version>2.9.1</log4j2.version>
 		<logback.version>1.2.3</logback.version>
 		<lombok.version>1.16.18</lombok.version>
-		<mariadb.version>2.1.2</mariadb.version>
+		<mariadb.version>2.2.0</mariadb.version>
 		<micrometer.version>1.0.0-rc.3</micrometer.version>
 		<mssql-jdbc.version>6.2.2.jre8</mssql-jdbc.version>
 		<mockito.version>2.11.0</mockito.version>