Add support for alternative xmlns

Used on Google's storage under https://storage.googleapis.com/bucket/

s3-bucket-list

@@ -69,7 +69,7 @@ while True:
 			break
 		attempt += 1
 		continue
-	if not body.startswith(b'<?xml version="1.0" encoding="UTF-8"?>\n<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">'):
+	if not body.startswith(b'<?xml version="1.0" encoding="UTF-8"?>\n<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">') and not body.startswith(b"<?xml version='1.0' encoding='UTF-8'?><ListBucketResult xmlns='http://doc.s3.amazonaws.com/2006-03-01'>"):
 		raise RuntimeError(f'Invalid body: {body[:200]}...')
 
 	if b'<Marker></Marker>' in body[:200] and 'marker' in params: