Bump mybatis from 3.5.3 to 3.5.6 in /redisson-mybatis

Bumps [mybatis](https://github.com/mybatis/mybatis-3) from 3.5.3 to 3.5.6.
- [Release notes](https://github.com/mybatis/mybatis-3/releases)
- [Commits](https://github.com/mybatis/mybatis-3/compare/mybatis-3.5.3...mybatis-3.5.6)

Signed-off-by: dependabot[bot] <support@github.com>

redisson-mybatis/pom.xml

@@ -54,7 +54,7 @@
         <dependency>
             <groupId>org.mybatis</groupId>
             <artifactId>mybatis</artifactId>
-            <version>3.5.3</version>
+            <version>3.5.6</version>
             <optional>true</optional>
         </dependency>