Update dependency sass-loader to v7.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
sass-loader	dependencies	minor	7.1.0 -> 7.2.0

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Release Notes

webpack-contrib/sass-loader

### [`v7.2.0`](https://togithub.com/webpack-contrib/sass-loader/blob/master/CHANGELOG.md#​720httpsgithubcomwebpack-contribsass-loadercomparev710v720-2019-08-08) [Compare Source](https://togithub.com/webpack-contrib/sass-loader/compare/v7.1.0...v7.2.0) ##### Bug Fixes - better handle stdin in sources ([#​681](https://togithub.com/webpack-contrib/sass-loader/issues/681)) ([e279f2a](https://togithub.com/webpack-contrib/sass-loader/commit/e279f2a)) - prefer `sass`/`scss`/`css` extensions ([#​711](https://togithub.com/webpack-contrib/sass-loader/issues/711)) ([6fc9d4e](https://togithub.com/webpack-contrib/sass-loader/commit/6fc9d4e)) - relax node engine ([#​708](https://togithub.com/webpack-contrib/sass-loader/issues/708)) ([2a51502](https://togithub.com/webpack-contrib/sass-loader/commit/2a51502)) ##### Features - allow passing `functions` option as function ([#​651](https://togithub.com/webpack-contrib/sass-loader/issues/651)) ([6c9654d](https://togithub.com/webpack-contrib/sass-loader/commit/6c9654d)) - support `data` as `Function` ([#​648](https://togithub.com/webpack-contrib/sass-loader/issues/648)) ([aa64e1b](https://togithub.com/webpack-contrib/sass-loader/commit/aa64e1b)) - support `sass` and `style` fields in `package.json` ([#​647](https://togithub.com/webpack-contrib/sass-loader/issues/647)) ([a8709c9](https://togithub.com/webpack-contrib/sass-loader/commit/a8709c9)) - support auto resolving `dart-sass` ([ff90dd6](https://togithub.com/webpack-contrib/sass-loader/commit/ff90dd6))

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