Update dependency sass-loader to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass-loader	11.0.1 -> 12.1.0

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Release Notes

webpack-contrib/sass-loader

v12.1.0

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Features

• allow String value for the implementation option (382a3ca)

v12.0.0

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⚠ BREAKING CHANGES

• minimum supported Node.js version is 12.13.0

Bug Fixes

• crash in custom importers with worker threads (#​958) (67aa139)
• resolving _index.import.scss/index.import.scss in packages (#​906) (6641a16)

11.1.1 (2021-05-13)

Bug Fixes

• disabled auto importing fiber on node >= 16 due incompatibility problems (#​950) (4ca004b)

v11.1.1

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v11.1.0

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Features

• support node-sass v6.0.0 (#​947) (7869b29)

11.0.1 (2021-02-08)

Bug Fixes

• compatibility with custom importers for node-sass (#​927) (af5a072)

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