Bump sass from 1.17.2 to 1.20.1 (#10908)

Bumps [sass](https://github.com/sass/dart-sass) from 1.17.2 to 1.20.1.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.17.2...1.20.1)

package.json

@@ -149,7 +149,7 @@
     "requestidlecallback": "^0.3.0",
     "reselect": "^4.0.0",
     "rimraf": "^2.6.3",
-    "sass": "^1.17.2",
+    "sass": "^1.20.1",
     "sass-loader": "^7.0.3",
     "stringz": "^1.0.0",
     "substring-trie": "^1.0.2",

yarn.lock

@@ -8344,10 +8344,10 @@ sass-loader@^7.0.3:
     pify "^3.0.0"
     semver "^5.5.0"
 
-sass@^1.17.2:
-  version "1.17.2"
-  resolved "https://registry.yarnpkg.com/sass/-/sass-1.17.2.tgz#b5a28f2f13c6a219f28084c03623bb2c8d176323"
-  integrity sha512-TBNcwSIEXpXAIaFxQnWbHzhciwPKpHRprQ+1ww+g9eHCiY3PINJs6vQTu+LcBt1vIhrtQGRFIoxJO39TfLrptA==
+sass@^1.20.1:
+  version "1.20.1"
+  resolved "https://registry.yarnpkg.com/sass/-/sass-1.20.1.tgz#737b901fe072336da540b6d00ec155e2267420da"
+  integrity sha512-BnCawee/L5kVG3B/5Jg6BFwASqUwFVE6fj2lnkVuSXDgQ7gMAhY9a2yPeqsKhJMCN+Wgx0r2mAW7XF/aTF5qtA==
   dependencies:
     chokidar "^2.0.0"