chore: suppress gradle warning (#75)

We recommend using a newer Android Gradle plugin to use `compileSdk = 35`

This Android Gradle plugin (8.1.2) was tested up to `compileSdk = 34`.

You are strongly encouraged to update your project to use a newer
Android Gradle plugin that has been tested with `compileSdk = 35`.

If you are already using the latest version of the Android Gradle plugin,
you may need to wait until a newer version with support for `compileSdk = 35` is available.

To suppress this warning, add/update

```
android.suppressUnsupportedCompileSdk=35
```

to this project's gradle.properties.

Reviewed-on: https://gitea.angry.im/PeterCxy/OpenEUICC/pulls/75


Co-authored-by: septs <github@septs.pw>
Co-committed-by: septs <github@septs.pw>