(#146) Resolve Webpack related vulnerabilities

[seyilonge-nci]

• Updated react-dev-utils from 10.2.1 to 12.0.1
• Updated webpack-dev-server from 3.11.0 to 4.11.0
• Resolved configuration issues from breaking changes
• Updated sass and related dependencies (css-loader, mini-css-extract-plugin, style-loader)

Closes https://github.com/NCIOCPL/sitewide-search-app/issues/146

[github-actions[bot]]

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