chore: remove usage of jcenter()

[r3nya]

Summary

I got a warning message about shuting down jcenter.

WARNING:: Please remove usages of jcenter() Maven repository from your build scripts and migrate your build to other Maven repositories.
This repository is deprecated and it will be shut down in the future.
See http://developer.android.com/r/tools/jcenter-end-of-service for more information.

Using this information we can drop this repo from gradle file.

[tido64]

We cannot do this yet. Please see the discussion in #610 (comment):

Unfortunately, we cannot remove JCenter without breaking people on older versions of React Native:

Could not determine the dependencies of task ':app:lintVitalRelease'.
> Could not resolve all artifacts for configuration ':app:debugCompileClasspath'.
   > Could not find com.facebook.flipper:flipper:0.54.0.
     Required by:
         project :app
   > Could not find com.facebook.flipper:flipper-fresco-plugin:0.54.0.
     Required by:
         project :app
   > Could not find com.facebook.flipper:flipper-network-plugin:0.54.0.
     Required by:
         project :app
   > Could not find com.facebook.yoga:proguard-annotations:1.14.1.
     Required by:
         project :app > com.facebook.react:react-native:0.63.4
   > Could not find com.facebook.fbjni:fbjni-java-only:0.0.3.
     Required by:
         project :app > com.facebook.react:react-native:0.63.4

Like I mentioned earlier, there is no urgency here since JCenter will be up in read-only mode indefinitely.

Read the update here: https://developer.android.com/studio/build/jcenter-migration

This is just a warning and will not affect your final output.

[r3nya]

Hi @tido64!

Got it, thanks