fix style and add changelog

CHANGES.rst

@@ -13,6 +13,18 @@ Infrastructure, Utility and Other Changes and Additions
 -------------------------------------------------------
 
 
+0.4.9 (TBD)
+===========
+
+Service fixes and enhancements
+------------------------------
+
+heasarc
+^^^^^^^
+
+- Fix Heasarc.download_data for Sciserver. [#3183]
+
+
 
 0.4.8 (2025-01-16)
 ==================

astroquery/heasarc/tests/test_heasarc.py

@@ -1,7 +1,6 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 
 import os
-import shutil
 import pytest
 import tempfile
 from unittest.mock import patch, PropertyMock
@@ -304,6 +303,7 @@ def test_download_data__missingcolumn(host):
     ):
         Heasarc.download_data(Table({"id": [1]}), host=host)
 
+
 def test_download_data__sciserver():
     with tempfile.TemporaryDirectory() as tmpdir:
         datadir = f'{tmpdir}/data'
@@ -321,6 +321,7 @@ def test_download_data__sciserver():
         assert os.path.exists(f'{downloaddir}/data')
         assert os.path.exists(f'{downloaddir}/data/file.txt')
 
+
 def test_download_data__outside_sciserver():
     with pytest.raises(
         FileNotFoundError,