Remove map extend

UNRELEASED-v9.md

@@ -41,6 +41,7 @@ Use [the changelog guidelines](/documentation/Versioning%20and%20changelog.md) t
 - Removed the `unstyled-link()` mixin and replaced any instances with values ([#4951](https://github.com/Shopify/polaris-react/pull/4951))
 - Removed the `unstyled-list()` mixin and replaced any instances with values ([#4960](https://github.com/Shopify/polaris-react/pull/4960))
 - Removed `high-contrast-outline()` and `high-contrast-border()` mixins and replaced any instances with tokens and values ([#4962](https://github.com/Shopify/polaris-react/pull/4962))
+- Removed the `map-extend` scss function ([#4970](https://github.com/Shopify/polaris-react/pull/4970))
 
 ### New components
 

src/styles/_common.scss

@@ -4,7 +4,6 @@
 
 // stylelint-disable scss/partial-no-import
 
-@import './foundation/utilities';
 @import './foundation/layout';
 @import './foundation/focus-ring';
 

src/styles/_public-api.scss

@@ -16,7 +16,6 @@
 
 // stylelint-disable scss/partial-no-import
 
-@import './foundation/utilities';
 @import './foundation/layout';
 @import './foundation/focus-ring';