Update kotlinCompileTesting to v0.5.0-alpha08

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
dev.zacsweers.kctfork:ksp	0.5.0-alpha07 -> 0.5.0-alpha08
dev.zacsweers.kctfork:core	0.5.0-alpha07 -> 0.5.0-alpha08

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