Bump atomicfu to v0.20.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlinx:atomicfu-gradle-plugin	0.20.0 -> 0.20.2
org.jetbrains.kotlinx:atomicfu	0.20.0 -> 0.20.2

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Release Notes

Kotlin/kotlinx.atomicfu

v0.20.2

Compare Source

• Fix for unresolved kotlinx-atomicfu-runtime dependency error (https://youtrack.jetbrains.com/issue/KT-57235),
  please see the corresponding PR for more comments (#​290).

v0.20.1

Compare Source

• Fixed passing kotlinx-atomicfu-runtime dependency to the runtime classpath (#​283).
• AV/LV set to 1.4 to be compatible with Gradle 7 (#​287).
• Enable cinterop commonization (#​282).

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