Update agp to v8.7.0-alpha08

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.android.test (source)	8.7.0-alpha07 -> 8.7.0-alpha08
com.android.library (source)	8.7.0-alpha07 -> 8.7.0-alpha08
com.android.application (source)	8.7.0-alpha07 -> 8.7.0-alpha08

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