Improved Promise polyfill for MicroPython only (#1517)

pyscript.core/esm/runtime/_utils.js

@@ -1,21 +1,7 @@
-import { getBuffer } from "../fetch-utils.js";
-import { absoluteURL, defineProperty } from "../utils.js";
 import "@ungap/with-resolvers";
 
-// REQUIRES INTEGRATION TEST
-/* c8 ignore start */
-// TODO: this should *NOT* be needed as the polyfill
-//       already patches on demand the Promise object
-const { withResolvers } = Promise;
-defineProperty(globalThis, "Promise", {
-    configurable: true,
-    value: class extends Promise {
-        withResolvers() {
-            return withResolvers.call(this);
-        }
-    },
-});
-/* c8 ignore stop */
+import { getBuffer } from "../fetch-utils.js";
+import { absoluteURL } from "../utils.js";
 
 /**
  * Trim code only if it's a single line that prettier or other tools might have modified.