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]>

pom.xml

@@ -46,7 +46,7 @@
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
 
-        <kotlin.version>1.3.50</kotlin.version>
+        <kotlin.version>1.6.0</kotlin.version>
         <kotlin.code.style>official</kotlin.code.style>
         <junit.version>5.4.2</junit.version>