Upgrade to Mariadb 1.5.8

Closes gh-8372

spring-boot-dependencies/pom.xml

@@ -130,7 +130,7 @@
 		<log4j2.version>2.7</log4j2.version>
 		<logback.version>1.1.10</logback.version>
 		<lombok.version>1.16.14</lombok.version>
-		<mariadb.version>1.5.7</mariadb.version>
+		<mariadb.version>1.5.8</mariadb.version>
 		<mssql-jdbc.version>6.1.0.jre7</mssql-jdbc.version>
 		<mockito.version>1.10.19</mockito.version>
 		<mongodb.version>3.4.1</mongodb.version>