Update dependency css-loader to v2.1.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
css-loader	devDependencies	patch	2.1.0 -> 2.1.1	source

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Release Notes

webpack-contrib/css-loader

v2.1.1

Compare Source

Bug Fixes

• do not break selector with escaping (#​896) (0ba8c66)
• source map generation when sourceRoot is present (#​901) (e9ce745)
• sourcemap generating when previous loader pass sourcemap as string (#​905) (3797e4d)

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