Enable the Summer Editions 2023 feature flag by default (#9821)

Author: sam-b-rose

.changeset/nice-zoos-vanish.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris': major
+---
+
+Enabled the Summer Editions 2023 feature flag by default

polaris-react/src/components/AppProvider/AppProvider.tsx

@@ -150,7 +150,7 @@ export class AppProvider extends Component<AppProviderProps, State> {
 
     return {
       ...features,
-      polarisSummerEditions2023: features?.polarisSummerEditions2023 ?? false,
+      polarisSummerEditions2023: features?.polarisSummerEditions2023 ?? true,
       polarisSummerEditions2023ShadowBevelOptOut:
         features?.polarisSummerEditions2023ShadowBevelOptOut ?? false,
     };