Quiet sass deprecations warning for dependencies

We are not planning to upgrade foundation-sites

config/webpack/webpack.config.js

@@ -6,5 +6,15 @@ const options = {
   }
 }
 
+const OFNwebpackConfig = merge(webpackConfig, options) 
+
+// quiet deprecations in dependencies, notably foundation-sites 
+const scssRule = OFNwebpackConfig.module.rules.find((rule) => rule.test.test(".scss"))
+const sassDefaultOptions = scssRule.use[3].options.sassOptions
+scssRule.use[3].options.sassOptions = {
+  ...sassDefaultOptions,
+  quietDeps: true
+}
+
 // This results in a new object copied from the mutable global
-module.exports = merge(webpackConfig, options)
+module.exports = OFNwebpackConfig