Bump org.jetbrains.kotlinx:kotlinx-coroutines-jdk8 in /lib/kotlin

Bumps [org.jetbrains.kotlinx:kotlinx-coroutines-jdk8](https://github.com/Kotlin/kotlinx.coroutines) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/Kotlin/kotlinx.coroutines/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.coroutines/blob/master/CHANGES.md)
- [Commits](https://github.com/Kotlin/kotlinx.coroutines/compare/1.8.0...1.8.1)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlinx:kotlinx-coroutines-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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