Bump kotlin from 2.0.0 to 2.0.20

Bumps `kotlin` from 2.0.0 to 2.0.20.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.0.0 to 2.0.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.0.20)

Updates `org.jetbrains.kotlin:kotlin-reflect` from 2.0.0 to 2.0.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.0.20)

Updates `org.jetbrains.kotlin:kotlin-stdlib-jdk8` from 2.0.0 to 2.0.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.0.20)

Updates `org.jetbrains.kotlin:kotlin-test-junit` from 2.0.0 to 2.0.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.0.20)

Updates `org.jetbrains.kotlin.jvm` from 2.0.0 to 2.0.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.0.20)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-reflect
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-test-junit
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ junit4 = "4.13.2"
 junit5 = "5.11.0"
 # https://plugins.jetbrains.com/docs/intellij/kotlin.html#adding-kotlin-support
 # https://kotlinlang.org/docs/releases.html#release-details
-kotlin = "2.0.0"
+kotlin = "2.0.20"
 # set in <root>/settings.gradle.kts
 kotlinCoroutines = "1.8.0"
 mockito = "5.12.0"