Update dependency org.jetbrains.kotlinx:atomicfu to v0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlinx:atomicfu	0.17.2 -> 0.21.0

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Release Notes

Kotlin/kotlinx.atomicfu (org.jetbrains.kotlinx:atomicfu)

v0.21.0

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• Updated Kotlin to 1.8.20.
• Updated Gradle to 7.3 (#​300).
• Updated kotlinx.metadata version to 0.6.0 (#​281).
• Minimal supported KGP(1.7.0) and Gradle(7.0) versions are set since this release.
• Removed JS Legacy configurations for KGP >= 1.9.0 (#​296).
• Fixed class duplication (from original and transformed directories) in Jar (#​301).
• Original class directories are not modified in case of compiler plugin application (#​312).

v0.20.2

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• 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

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• 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).

v0.20.0

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• Update Kotlin to 1.8.10.
• Support all official K/N targets (#​275).

v0.19.0

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• Update Kotlin to 1.8.0.
• Update LV to 1.8 (#​270).
• Prepare atomicfu for including to the Kotlin Aggregate build (#​265).

v0.18.5

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• Support JVM IR compiler plugin (#​246).
• Update Kotlin to 1.7.20.
• Added more tests for atomicfu-gradle-plugin (#​255).

v0.18.4

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• Fix KGP compatibility bug with freeCompilerArgs modification (#​247).
• Update kotlinx.metadata to 0.5.0 (#​245).
• Update gradle version to 6.8.3 (#​244)

v0.18.3

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• Fix for atomicfu-gradle-plugin application to the MPP project (for Kotlin 1.7.20).

v0.18.2

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• In Kotlin 1.7.10 the name of atomicfu-runtime module was reverted back to kotlinx-atomicfu-runtime,
  as the renaming was an incompatible change.
  Fixed atomicfu-gradle-plugin to add kotlinx-atomicfu-runtime dependency directly.

v0.18.1

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• Fix for the compatibility issue: add atomicfu-runtime dependency directly since Kotlin 1.7.10.

v0.18.0

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• Update Kotlin to 1.7.0.
• Fix kotlin 1.7 compatibility (#​222).
• Update JVM target to 1.8 (see KT-45165).
• Fix for parsing Kotlin version in AtomicfuGradlePlugin.

v0.17.3

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• Adding compiler plugin dependency only for projects with KGP >= 1.6.20 (#​226).
• Compiler plugin runtime dependency fixes (#​230).
• Update README badges (#​228).

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