PR-37864: upgrade drop-ins, android to 6.16.0 and iOS to 5.23.0#2

jmarente merged 1 commit intomasterspotahome/react-native-braintree-dropin-ui-fork:masterfrom

PR-37864spotahome/react-native-braintree-dropin-ui-fork:PR-37864Copy head branch name to clipboard