Bump mybatis from 3.5.0 to 3.5.6

Bumps [mybatis](https://github.com/mybatis/mybatis-3) from 3.5.0 to 3.5.6.
- [Release notes](https://github.com/mybatis/mybatis-3/releases)
- [Commits](mybatis/mybatis-3@mybatis-3.5.0...mybatis-3.5.6)

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -71,7 +71,7 @@
 
     <!-- DB -->
     <hikaricp.version>3.2.0</hikaricp.version>
-    <mybatis.version>3.5.0</mybatis.version>
+    <mybatis.version>3.5.6</mybatis.version>
     <postgres.version>9.4-1205-jdbc41</postgres.version>
 
     <!-- test -->