Plugin and runtime library compatibility issues

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Starting from 0.27.0, a project applying the AFU Gradle plugin has to use Gradle >= 8.2. And if a project applies AFU to native source sets, the Kotlin version used by the project could not be lower than the major Kotlin version used to compile AFU runtime library (which is 2.1 as of now).

That's a significant divergence from versions mentioned in the project's README.