doc: fix broken link to TC39 import attributes proposal

The import assertion proposal has been renamed and
the old URL does not redirect to the new one. So let's update our
URL to point to the import attributes proposal, which is what
import assertions have been renamed to.

PR-URL: nodejs#47954
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Author: Trott

doc/api/vm.md

@@ -1585,7 +1585,7 @@ are not controllable through the timeout either.
 [`Error`]: errors.md#class-error
 [`URL`]: url.md#class-url
 [`eval()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval
-[`optionsExpression`]: https://tc39.es/proposal-import-assertions/#sec-evaluate-import-call
+[`optionsExpression`]: https://tc39.es/proposal-import-attributes/#sec-evaluate-import-call
 [`script.runInContext()`]: #scriptrunincontextcontextifiedobject-options
 [`script.runInThisContext()`]: #scriptruninthiscontextoptions
 [`url.origin`]: url.md#urlorigin

test/fixtures/snapshot/typescript.js

@@ -135144,7 +135144,7 @@ var ts;
              *  import "foo" |
              * or after a re-export declaration that has a module specifier:
              *  export { foo } from "foo" |
-             * Source: https://tc39.es/proposal-import-assertions/
+             * Source: https://tc39.es/proposal-import-attributes/
              */
             if (contextToken) {
                 var file = contextToken.getSourceFile();