Merge pull request #528 from mybatis/dependabot/maven/kotlin.version-1.4.21-2

Bump kotlin.version from 1.4.21 to 1.4.21-2

Author: hazendaz

mybatis-spring-boot-samples/mybatis-spring-boot-sample-kotlin/pom.xml

@@ -28,7 +28,7 @@
   <name>mybatis-spring-boot-sample-kotlin</name>
   <properties>
     <module.name>org.mybatis.spring.boot.sample.kotlin</module.name>
-    <kotlin.version>1.4.21</kotlin.version>
+    <kotlin.version>1.4.21-2</kotlin.version>
     <java.version>1.8</java.version>
   </properties>
   <dependencies>