Change from AVD 33 to [AVD 34](https://chrome-infra-packages.appspot.com/p/chromium/tools/android/avd/linux-amd64) in CI. Only affects two tests.

We should also update the firebase virtual and physical devices when 34 is available there (for example [here](https://github.com/flutter/flutter/blob/e98d3929ca421ca11dcc7662f59e73e0a7d293bd/.ci.yaml#L441)), as that will allow us to update a lot more tests.