Update dependency grunt-contrib-sass to v2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt-contrib-sass	1.0.0 -> 2.0.0

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Release Notes

gruntjs/grunt-contrib-sass (grunt-contrib-sass)

### [`v2.0.0`](https://togithub.com/gruntjs/grunt-contrib-sass/releases/tag/v2.0.0) [Compare Source](https://togithub.com/gruntjs/grunt-contrib-sass/compare/v1.0.0...v2.0.0) - Merge pull request [#​259](https://togithub.com/gruntjs/grunt-contrib-sass/issues/259) from gruntjs/upt-deps-3 [`ede3adf`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/ede3adf) - v2.0.0 changelog [`0630c1e`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/0630c1e) - Bump some dependencies [`4274480`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/4274480) - Merge pull request [#​258](https://togithub.com/gruntjs/grunt-contrib-sass/issues/258) from gruntjs/dependabot/npm_and_yarn/lodash-4.17.20 [`44b0860`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/44b0860) - Merge pull request [#​257](https://togithub.com/gruntjs/grunt-contrib-sass/issues/257) from gruntjs/dependabot/npm_and_yarn/underscore.string-3.3.5 [`6f07e49`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/6f07e49) - Bump lodash from 4.17.15 to 4.17.20 [`6d8c550`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/6d8c550) - Bump underscore.string from 3.3.4 to 3.3.5 [`c09853e`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/c09853e) - Merge pull request [#​256](https://togithub.com/gruntjs/grunt-contrib-sass/issues/256) from gruntjs/update-ci [`b67504c`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/b67504c) - Update CI targets [`9da4296`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/9da4296) - Merge pull request [#​252](https://togithub.com/gruntjs/grunt-contrib-sass/issues/252) from gruntjs/dependabot/npm_and_yarn/lodash-4.17.15 [`3602226`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/3602226) - Bump lodash from 4.17.10 to 4.17.15 [`409b019`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/409b019) - Merge pull request [#​248](https://togithub.com/gruntjs/grunt-contrib-sass/issues/248) from gruntjs/dev [`e1f8664`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/e1f8664) - Update all deps, drop Node.js < 6 support, and update links. [`f98c38c`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/f98c38c) - Upgrade grunt and devDeps to 1.0. [`4d56455`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/4d56455) - Update AppVeyor config. [`be8205a`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/be8205a) - Fix tests on Windows. [`519d4d2`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/519d4d2) - Update CHANGELOG. [`fe81ce8`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/fe81ce8) - Add Appveyor for Windows testing. [`fe1308a`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/fe1308a) - Update dependencies. [`eb295c5`](https://togithub.com/gruntjs/grunt-contrib-sass/commit/eb295c5)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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