Remove now unused imports from tweaks

Author: sadielbartholomew

cf/test/test_Data.py

@@ -2,11 +2,9 @@
 import contextlib
 import datetime
 import faulthandler
-from importlib.util import find_spec
 import io
 import itertools
 import os
-import shutil
 import tempfile
 import unittest
 import warnings

cf/test/test_style.py

@@ -2,7 +2,6 @@
 import faulthandler
 from importlib.util import find_spec
 import os
-import shutil
 import unittest
 
 faulthandler.enable()  # to debug seg faults and timeouts