Bump kotlin.version from 1.3.50 to 1.3.60
Bump kotlin.version from 1.3.50 to 1.3.60

Bumps `kotlin.version` from 1.3.50 to 1.3.60.

Updates `kotlin-stdlib-jdk8` from 1.3.50 to 1.3.60
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `kotlin-maven-plugin` from 1.3.50 to 1.3.60

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jeffgbutler/mybatis-dynamic-sql,jeffgbutler/mybatis-qbe,jeffgbutler/mybatis-qbe,jeffgbutler/mybatis-dynamic-sql