Bump org.jetbrains.kotlin:kotlin-stdlib from 1.9.20 to 1.9.21 (#3175)

Bumps [org.jetbrains.kotlin:kotlin-stdlib](https://github.com/JetBrains/kotlin) from 1.9.20 to 1.9.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.20...v1.9.21)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gradle/dependencies.gradle

@@ -35,7 +35,7 @@ libraries.bndGradle =  'biz.aQute.bnd:biz.aQute.bnd.gradle:6.4.0'
 
 libraries.groovy = 'org.codehaus.groovy:groovy:3.0.19'
 
-def kotlinVersion = '1.9.20'
+def kotlinVersion = '1.9.21'
 libraries.kotlin = [
     version: kotlinVersion,