Bump kotlin-stdlib from 1.6.20 to 1.6.21

Bumps [kotlin-stdlib](https://github.com/JetBrains/kotlin) from 1.6.20 to 1.6.21.
- [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)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -61,7 +61,7 @@ dependencies {
       }
     }
   }
-  implementation("org.jetbrains.kotlin:kotlin-stdlib:1.6.20")
+  implementation("org.jetbrains.kotlin:kotlin-stdlib:1.6.21")
   implementation("org.jetbrains.kotlin:kotlin-reflect:1.6.21")
 
   implementation("io.github.microutils:kotlin-logging:2.1.21")