Use an ellipsis character instead (#40913)

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For context, making a test change to allow testing CI changes in
#40910 without approval each run.

@ijjk How's this? The string's not being snapshotted so it shouldn't
break any tests.

test/integration/preload-viewport/pages/invalid-prefetch.js

@@ -3,7 +3,7 @@ import Link from 'next/link'
 export default () => (
   <>
     <Link href="/something-invalid-oops">
-      <a id="invalid-link">I'm broken...</a>
+      <a id="invalid-link">I'm broken…</a>
     </Link>
   </>
 )