Bump kotlin-stdlib from 1.3.72 to 1.6.0

Bumps [kotlin-stdlib](https://github.com/JetBrains/kotlin) from 1.3.72 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@v1.3.72...v1.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -23,7 +23,7 @@
         <maven-tools.version>3.6.0</maven-tools.version>
         <maven-artifact-transfer.version>0.12.0</maven-artifact-transfer.version>
 
-        <kotlin.version>1.3.72</kotlin.version>
+        <kotlin.version>1.6.0</kotlin.version>
 
         <markdown-junit-engine.version>0.0.2</markdown-junit-engine.version>
         <junit.version>5.6.2</junit.version>