Update dependency css-loader to v6.8.1

This MR contains the following updates:

Package	Type	Update	Change
css-loader	devDependencies	minor	6.7.3 -> 6.8.1

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Release Notes

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

v6.8.1

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v6.8.0

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Features

• use template literal when it possible to prevent Maximum call stack size exceeded (#​1525) (6eb5661)

Bug Fixes

• warning and error serialization (#​1523) (3e52969)

6.7.4 (2023-05-19)

Bug Fixes

• bugs in css modules (c3099fb)
• output warning when built-in CSS support enabled (#​1520) (0700ce8)

6.7.3 (2022-12-14)

Bug Fixes

• remove sourceURL from emitted CSS (#​1487) (962924c)

6.7.2 (2022-11-13)

Bug Fixes

• css modules generation with inline syntax (#​1480) (2f4c273)

6.7.1 (2022-03-08)

Bug Fixes

• defaultGetLocalIdent export (#​1427) (74dac1e)

v6.7.4

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