Consume downloads instead of piping them

This is a workaround for an issue related to node v18.16.0, the stream module and undici. See nodejs/undici#2173 for the details.

packages/hardhat-core/src/internal/util/download.ts

@@ -1,9 +1,7 @@
 import type { Dispatcher } from "undici";
 
-import fs from "fs";
 import fsExtra from "fs-extra";
 import path from "path";
-import util from "util";
 
 import { getHardhatVersion } from "./packageInfo";
 import { shouldUseProxy } from "./proxy";
@@ -26,9 +24,7 @@ export async function download(
  timeoutMillis = 10000,
  extraHeaders: { [name: string]: string } = {}
 ) {
- const { pipeline } = await import("stream");
  const { getGlobalDispatcher, ProxyAgent, request } = await import("undici");
- const streamPipeline = util.promisify(pipeline);
 
  let dispatcher: Dispatcher;
  if (process.env.http_proxy !== undefined && shouldUseProxy(url)) {
@@ -52,10 +48,11 @@ export async function download(
  });
 
  if (response.statusCode >= 200 && response.statusCode <= 299) {
+ const responseBody = await response.body.arrayBuffer();
  const tmpFilePath = resolveTempFileName(filePath);
  await fsExtra.ensureDir(path.dirname(filePath));
 
- await streamPipeline(response.body, fs.createWriteStream(tmpFilePath));
+ await fsExtra.writeFile(tmpFilePath, responseBody);
  return fsExtra.move(tmpFilePath, filePath, { overwrite: true });
  }
  // undici's response bodies must always be consumed to prevent leaks