Update dependency org.mariadb.jdbc:mariadb-java-client to v3.5.6

Author: renovate[bot]

pom.xml

@@ -202,7 +202,7 @@
     <dependency>
       <groupId>org.mariadb.jdbc</groupId>
       <artifactId>mariadb-java-client</artifactId>
-      <version>3.5.5</version>
+      <version>3.5.6</version>
       <scope>test</scope>
     </dependency>
     <dependency>