Bump mybatis from 3.4.5 to 3.5.6 in /porter_springboot

Bumps [mybatis](https://github.com/mybatis/mybatis-3) from 3.4.5 to 3.5.6.
- [Release notes](https://github.com/mybatis/mybatis-3/releases)
- [Commits](https://github.com/mybatis/mybatis-3/compare/mybatis-3.4.5...mybatis-3.5.6)

---
updated-dependencies:
- dependency-name: org.mybatis:mybatis
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/porter_springboot/pom.xml b/porter_springboot/pom.xml
index 86d25ea..d2e34ef 100644
--- a/porter_springboot/pom.xml
+++ b/porter_springboot/pom.xml
@@ -35,7 +35,7 @@
       <dependency>
         <groupId>org.mybatis</groupId>
         <artifactId>mybatis</artifactId>
-        <version>3.4.5</version>
+        <version>3.5.6</version>
       </dependency>
       <dependency>
         <groupId>org.mybatis</groupId>