Bump kotlin-stdlib from 1.3.50 to 1.6.0

Bumps [kotlin-stdlib](https://github.com/JetBrains/kotlin) from 1.3.50 to 1.6.0.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.6.0/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.3.50...v1.6.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -10,7 +10,7 @@
     <artifactId>sypht-kotlin-client</artifactId>
     <version>1.1</version>
     <properties>
-        <kotlin.version>1.3.50</kotlin.version>
+        <kotlin.version>1.6.0</kotlin.version>
     </properties>
 
     <pluginRepositories>