Update agp to v8.12.0-rc01

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.android.kotlin.multiplatform.library (source)	8.12.0-alpha08 -> 8.12.0-rc01
com.android.application (source)	8.12.0-alpha08 -> 8.12.0-rc01

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[renovate]

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