Await finish of filestream so file is created for node16

packages/artifact/src/internal/download-http-client.ts

@@ -219,6 +219,14 @@ export class DownloadHttpClient {
       fileDownloadPath: string
     ): Promise<void> => {
       destinationStream.close()
+      // await until file is created at downloadpath
+      // wrap destinationStream's open event in promise 
+      await new Promise<void>(resolve => {
+        destinationStream.on('close', resolve)
+        if (destinationStream.writableFinished) {
+          resolve()
+        }
+      });
       await rmFile(fileDownloadPath)
       destinationStream = fs.createWriteStream(fileDownloadPath)
     }
@@ -273,8 +281,8 @@ export class DownloadHttpClient {
         // if a throttled status code is received, try to get the retryAfter header value, else differ to standard exponential backoff
         isThrottledStatusCode(response.message.statusCode)
           ? await backOff(
-              tryGetRetryAfterValueTimeInMilliseconds(response.message.headers)
-            )
+            tryGetRetryAfterValueTimeInMilliseconds(response.message.headers)
+          )
           : await backOff()
       } else {
         // Some unexpected response code, fail immediately and stop the download