Bump react-native-android docker container to 8.0 (#36954)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36954

This bumps the docker container we use to the latest major.

Changelog:
[Internal] [Changed] - Bump react-native-android docker container to 8.0

Reviewed By: cipolleschi

Differential Revision: D45083111

fbshipit-source-id: 44285e3e9af9be352c23bb1066fed3c35f51fb29