build(deps): bump kotlin-stdlib from 1.3.30 to 1.6.0

Bumps [kotlin-stdlib](https://github.com/JetBrains/kotlin) from 1.3.30 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@v1.3.30...v1.6.0)

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

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

Author: dependabot[bot]

pom.xml

@@ -38,7 +38,7 @@
     </developers>
 
     <properties>
-        <kotlin.version>1.3.30</kotlin.version>
+        <kotlin.version>1.6.0</kotlin.version>
         <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
         <java.version>1.8</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>