Fix sass importLoaders (#8281)

Author: mariusc23

packages/react-scripts/config/webpack.config.js

@@ -531,7 +531,7 @@ module.exports = function(webpackEnv) {
               exclude: sassModuleRegex,
               use: getStyleLoaders(
                 {
-                  importLoaders: 2,
+                  importLoaders: 3,
                   sourceMap: isEnvProduction && shouldUseSourceMap,
                 },
                 'sass-loader'
@@ -548,7 +548,7 @@ module.exports = function(webpackEnv) {
               test: sassModuleRegex,
               use: getStyleLoaders(
                 {
-                  importLoaders: 2,
+                  importLoaders: 3,
                   sourceMap: isEnvProduction && shouldUseSourceMap,
                   modules: {
                     getLocalIdent: getCSSModuleLocalIdent,