`css-loader` is deprecated

[JamieB-gu]

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:

dotcom-rendering/dotcom-rendering/webpack/webpack.config.client.js

Lines 137 to 140 in 766d508

	{
	test: /\.css$/,
	use: ['to-string-loader', 'css-loader'],
	},