Update webpack to fix dynamic imports

Created by: cinnamonKale

In v3.0.1, using webpack@4.29.6, dynamic imports fail. See the issue here. The issue's been fixed since 4.30.0, with the latest current version at 4.35.0

When will react-scripts be updated with the fixed version of webpack? I imagine it's a simple dependency update, but I don't know how the latest version will affect CRA