fix: polyfill Object.hasOwn for node 14 (#4152)

Author: ljharb

lib/core/imports/index.js

@@ -7,6 +7,11 @@ import Color from 'colorjs.io';
 import es6promise from 'es6-promise';
 import { Uint32Array } from 'typedarray';
 import 'weakmap-polyfill';
+import hasOwn from 'core-js-pure/actual/object/has-own';
+
+if (!('hasOwn' in Object)) {
+  Object.hasOwn = hasOwn;
+}
 
 // prevent striping newline characters from strings (e.g. failure
 // summaries). value must be synced with build/configure.js