Google Android SDK dependency terms notice

The published Maven POM metadata for the following CaptainCalc release
dependencies identifies the "Android Software Development Kit License":

- com.android.billingclient:billing:8.3.0
- com.google.firebase Firebase SDK modules resolved by Firebase BoM 34.16.0
- com.google.android.gms Google Play services modules in the release graph
- com.google.android.play Play runtime modules in the release graph

Official terms:
https://developer.android.com/studio/terms.html

These are vendor SDK terms, not an open-source license declaration. This
notice records the terms identity and official URL from the published POM
metadata; the current terms at the official URL govern.