Android: Remove the remaining JCenter dependencies

[tido64]

As a follow-up to #278, we need to remove the remaining react-native dependencies when they've been published to Maven Central.

[sweggersen]

@tido64 , do you know if the dependencies have been published to Maven Central?

        includeGroup("com.facebook.fbjni")
        includeGroup("com.facebook.flipper")
        includeGroup("com.facebook.fresco")
        includeGroup("com.facebook.yoga")

[tido64]

@tido64 , do you know if the dependencies have been published to Maven Central?

As far as I know, only the versions that 0.65+ depends on are uploaded. If we're targeting older versions, we still need to use JCenter.

[sweggersen]

Ok, thanks. Another reason to move to 0.65+.