Update jest.setup.ts

Co-authored-by: Vincent <Vinnl@users.noreply.github.com>

jest.setup.ts

@@ -12,6 +12,11 @@ import failOnConsole from "jest-fail-on-console";
 import * as globalStorybookConfig from "./.storybook/preview";
 import "jest-axe/extend-expect";
 
+// `@types/jest-axe` doesn't extend `expect` when imported from `@jest/globals`.
+// This manually sets the correct type. Note that it has to extend the
+// TestingLibraryMatchers to avoid overriding those.
+// Also see
+// https://github.com/DefinitelyTyped/DefinitelyTyped/pull/67495
 declare module "expect" {
   interface Matchers<R = void>
     extends TestingLibraryMatchers<typeof expect.stringContaining, R> {