chore(deps): update dependency css-loader to v6

This MR contains the following updates:

Package	Type	Update	Change
css-loader	devDependencies	major	5.2.7 -> 6.2.0

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Release Notes

webpack-contrib/css-loader

v6.2.0

Compare Source

v6.1.0

Compare Source

v6.0.0

Compare Source

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