`css-loader` is deprecated

https://github.com/webpack/css-loader#css-loader

The project recommends using webpack's built-in CSS parsing: https://webpack.js.org/guides/native-css

We use it here:

https://github.com/guardian/dotcom-rendering/blob/766d50865976d1959103d16dd15089d739b0f44d/dotcom-rendering/webpack/webpack.config.client.js#L137-L140

Start with the css-loader configuration at webpack/webpack.config.client.js lines 137-140, then read the linked webpack native CSS guide and compare it with the current setup. The work is done when the deprecated css-loader usage is replaced by webpack’s built-in CSS parsing and the client build still succeeds.

Written by the indexing model from the issue text.