Fixed flake8 errors

Author: simonw

sqlite_utils/cli.py

@@ -489,7 +489,7 @@ def add_foreign_key(
 def add_foreign_keys(path, foreign_key, load_extension):
     """
     Add multiple new foreign key constraints to a database
-    
+
     Example:
 
     \b

tests/test_cli.py

@@ -924,7 +924,6 @@ def test_upsert(db_path, tmpdir):
 
 def test_upsert_pk_required(db_path, tmpdir):
     json_path = str(tmpdir / "dogs.json")
-    db = Database(db_path)
     insert_dogs = [
         {"id": 1, "name": "Cleo", "age": 4},
         {"id": 2, "name": "Nixie", "age": 4},