Update dependency css-loader to v6.7.3

This MR contains the following updates:

Package	Type	Update	Change
css-loader	dependencies	minor	6.5.1 -> 6.7.3

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Release Notes

webpack-contrib/css-loader

v6.7.3

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v6.7.2

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v6.7.1

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v6.7.0

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Features

• re-export defaultGetLocalIdent (#​1423) (207cf36)

v6.6.0

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Features

• added the hashStrategy option (ca4abce)

6.5.1 (2021-11-03)

Bug Fixes

• regression with unicode characters in locals (b7a8441)
• runtime path generation (#​1393) (feafea8)

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