chore: add namespace to `build.gradle` for react-native 0.73+

[szymonrybczak]

Description

One Line Summary

This is a change that'll be required starting from React Native 0.73.x. More context can be found here: https://github.com/react-native-community/discussions-and-proposals/issues/671

Testing

Manual testing

Run the example app on android, everything should work fine ✅

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This change is 

[nan-li]

Hi @szymonrybczak,

Thank you so much for bringing this to our attention. It looks like there are some other updates around AGP and Java versions. We will have to test and ensure backwards compatibility.