[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/test_integration.py

@@ -1,6 +1,7 @@
 """
 Test that the asdf library integration is working properly.
 """
+
 import sys
 
 if sys.version_info < (3, 9):

tests/test_manifest.py

@@ -2,6 +2,7 @@
 Test that the manifest file is correctly structured and refers
 to schemas that exist.
 """
+
 import asdf
 import pytest
 

tests/test_schemas.py

@@ -1,6 +1,7 @@
 """
 Test features of the schemas not covered by the metaschema.
 """
+
 import re
 from collections.abc import Mapping