Update dependency com.squareup.leakcanary:leakcanary-android to v3.0-alpha-8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.squareup.leakcanary:leakcanary-android	3.0-alpha-7 -> 3.0-alpha-8

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Release Notes

square/leakcanary (com.squareup.leakcanary:leakcanary-android)

### [`v3.0-alpha-8`](https://togithub.com/square/leakcanary/releases/tag/v3.0-alpha-8) See [Change Log](https://square.github.io/leakcanary/changelog)

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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