switch to slice in createRuntimePrefetchTransformStream (#85822)

It's safer to copy here than to pass a reference, because it's possible
that the underlying chunk became detached. Accidentally tweaked this
before landing #85595

Author: ztanner

packages/next/src/server/app-render/app-render.tsx

@@ -1129,7 +1129,7 @@ function createRuntimePrefetchTransformStream(
         controller.enqueue(replace)
         // If there are bytes in the currentChunk after the match enqueue them
         if (currentIndex + searchLen < currentChunk.length) {
-          controller.enqueue(currentChunk.subarray(currentIndex + searchLen))
+          controller.enqueue(currentChunk.slice(currentIndex + searchLen))
         }
         // If we have a next chunk we enqueue it now
         if (nextChunk) {