Update dependency sass-loader to v12.6.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass-loader	12.4.0 -> 12.6.0

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Release Notes

webpack-contrib/sass-loader

v12.6.0

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Features

• added support for automatic loading of sass-embedded (#​1025) (c8dae87)

v12.5.0

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Features

• added support for sass-embedded (faster than node-sass), feel free to feedback
• added the api option (modern api is experimental and currently doesn't support built-in webpack resolver) (afbe114)

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