fix(Scripts): Fix bump-oss-version scripts (#1420)
fix(Scripts): Fix bump-oss-version scripts (#1420)

For some reason on Windows we have to explicitly convert the output of `cat(...).replace(...)` to a ShellString, and we also don't have `grep` on Windows, so removing the check for now (which doesn't actually check that everything updates, only that package.json does, which means you really should check the result anyway).
lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows,lbochenek/react-native-windows