Update dependency css-loader to v6.4.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
css-loader	6.2.0 -> 6.4.0

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Release Notes

webpack-contrib/css-loader

v6.4.0

Compare Source

Features

• generate more collision resistant for locals (c7db752)

Bug Fixes

• classes generation for client and server bundling (303a3a1)

v6.3.0

Compare Source

Features

• added [folder] placeholder (a0dee4f)
• added the exportType option with 'array', 'string' and 'css-style-sheet' values (c6d2066)
  • 'array' - the default export is Array with API for style-loader and other
  • 'string' - the default export is String you don't need to-string-loader loader anymore
  • 'css-style-sheet' - the default export is a constructable stylesheet, you can use import sheet from './styles.css' assert { type: 'css' }; like in a browser, more information you can find here
• supported supports() and layer() functions in @import at-rules (#​1377) (bce2c17)
• fix multiple merging multiple @media at-rules (#​1377) (bce2c17)

Bug Fixes

• reduce runtime (#​1378) (cf3a3a7)

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