Bump mybatis from 3.4.5 to 3.5.6 in /authentication-server (#43)

diff --git a/authentication-server/pom.xml b/authentication-server/pom.xml
index b9d4dc5..698227f 100644
--- a/authentication-server/pom.xml
+++ b/authentication-server/pom.xml
@@ -33,7 +33,7 @@
       <dependency>
         <groupId>org.mybatis</groupId>
         <artifactId>mybatis</artifactId>
-        <version>3.4.5</version>
+        <version>3.5.6</version>
       </dependency>
       <dependency>
         <groupId>org.mybatis</groupId>