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] <support@github.com>

pom.xml

@@ -30,7 +30,7 @@
     <guava.version>18.0</guava.version>
     <hikaricp.version>3.4.5</hikaricp.version>
     <metrics.version>4.2.5</metrics.version>
-    <mybatis.version>3.5.2</mybatis.version>
+    <mybatis.version>3.5.6</mybatis.version>
     <mybatis-ehcache.version>1.0.0</mybatis-ehcache.version>
     <slf4j-api.version>1.7.30</slf4j-api.version>