Update dependency firebase_app_check to ^0.0.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
firebase_app_check (source)	dependencies	patch	^0.0.7 -> ^0.0.8

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Release Notes

firebase/flutterfire

### [`v0.0.8`](https://togithub.com/firebase/flutterfire/blob/HEAD/CHANGELOG.md#firebaseappcheck---v008) - **FEAT**: provide `androidDebugProvider` boolean for android debug provider & update app check example app ([#​9412](https://togithub.com/firebase/flutterfire/issues/9412)). ([f1f26748](https://togithub.com/firebase/flutterfire/commit/f1f26748615c7c9d406e1d3d605e2987e1134ee7))

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