Bump org.jetbrains.kotlinx:kotlinx-coroutines-jdk8 in /lib/kotlin (#2798)

Bumps [org.jetbrains.kotlinx:kotlinx-coroutines-jdk8](https://github.com/Kotlin/kotlinx.coroutines) from 1.6.1 to 1.6.4.
- [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/1.6.1...1.6.4)

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

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