Update dependency css-loader to v7

This MR contains the following updates:

Package	Type	Update	Change
css-loader	devDependencies	major	^6.10.0 -> ^7.0.0

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Release Notes

webpack-contrib/css-loader (css-loader)

v7.1.2

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v7.1.1

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v7.1.0

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v7.0.0

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