More retries on item existence check

ia-upload-stream

@@ -251,7 +251,8 @@ def upload(item, filename, metadata, *, iaConfigFile = None, partSize = 100*1024
 		logger.info(f'Got upload ID {uploadId}')
 
 		# Wait for the item to exist; if the above created the item, it takes a little while for IA to actually create the bucket, and uploads would fail with a 404 until then.
-		for attempt in range(1, tries + 1):
+		# Use twice the normal amount of retries because it frequently breaks...
+		for attempt in range(1, 2 * tries + 1):
 			logger.info(f'Checking for existence of {item}')
 			r = requests.get(f'https://s3.us.archive.org/{item}/', headers = headers, timeout = TIMEOUT)
 			if r.status_code == 200: