Bump flatted from 3.3.3 to 3.4.2 in /samples/Calculator/cppwinrt#1174

vineethkuttan merged 1 commit intomainmicrosoft/react-native-windows-samples:mainfrom

dependabot/npm_and_yarn/samples/Calculator/cppwinrt/flatted-3.4.2microsoft/react-native-windows-samples:dependabot/npm_and_yarn/samples/Calculator/cppwinrt/flatted-3.4.2Copy head branch name to clipboard