Fix building for android

• To fix the Android embedding V2 error, I followed the migration guide only to see that everything except 3 is already done.
• When compiling, I saw that a newer Kotlin version should be used. So bumped it to the latest version, as recommended.

Currently, the builds fail, because of the missing keystore for signing. When compiling the APK locally, a keystore should be present, fixing compiling locally. I am not really interested in looking at the CI / I probably should not do anything involving the project's keystore, and thus likely won't do that too in the near future. If this MR does not provide enough value to the project, feel free to reject it.