chore(deps): update dependency grunt-sass to v3

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt-sass	2.0.0 -> 3.1.0

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Release Notes

sindresorhus/grunt-sass

v3.1.0

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• Improve Sass error output (#​296) 08df45d

v3.0.2

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v3.0.1

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v3.0.0

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This release requires Node.js 8 or later.

You now have to choose whether you want node-sass or dart-sass by installing one of them yourself and setting it in the options. See the updated docs: https://github.com/sindresorhus/grunt-sass#usage

Don't forget const sass = require('node-sass') or const sass = require('dart-sass').

v2.1.0

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