Bump mybatis from 3.5.5 to 3.5.6

Bumps [mybatis](https://github.com/mybatis/mybatis-3) from 3.5.5 to 3.5.6.
- [Release notes](https://github.com/mybatis/mybatis-3/releases)
- [Commits](https://github.com/mybatis/mybatis-3/compare/mybatis-3.5.5...mybatis-3.5.6)
Signed-off-by: Ndependabot[bot] <support@github.com>

pom.xml

@@ -41,7 +41,7 @@
         <swagger-models.version>1.6.0</swagger-models.version>
         <swagger-annotations.version>1.6.0</swagger-annotations.version>
         <mybatis-generator.version>1.4.0</mybatis-generator.version>
-        <mybatis.version>3.5.5</mybatis.version>
+        <mybatis.version>3.5.6</mybatis.version>
         <mysql-connector.version>8.0.20</mysql-connector.version>
         <spring-data-commons.version>2.3.0.RELEASE</spring-data-commons.version>
         <jjwt.version>0.9.0</jjwt.version>