Linter fixes from new black

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

examples/manual_repo/basic_repo.py

@@ -20,6 +20,7 @@
 NOTE: Metadata files will be written to a 'tmp*'-directory in CWD.
 
 """
+
 import os
 import tempfile
 from datetime import datetime, timedelta

examples/manual_repo/hashed_bin_delegation.py

@@ -15,6 +15,7 @@
 NOTE: Metadata files will be written to a 'tmp*'-directory in CWD.
 
 """
+
 import hashlib
 import os
 import tempfile

tests/test_metadata_serialization.py

@@ -536,7 +536,7 @@ def test_delegation_serialization(self, test_case_data: str) -> None:
 
     invalid_targetfiles: utils.DataSet = {
         "no hashes": '{"length": 1}',
-        "no length": '{"hashes": {"sha256": "abc"}}'
+        "no length": '{"hashes": {"sha256": "abc"}}',
         # The remaining cases are the same as for invalid_hashes and
         # invalid_length datasets.
     }

tests/test_trusted_metadata_set.py

@@ -1,4 +1,5 @@
 """Unit tests for 'tuf/ngclient/_internal/trusted_metadata_set.py'."""
+
 import logging
 import os
 import sys

tests/test_updater_top_level_update.py

@@ -555,9 +555,9 @@ def test_new_targets_hash_mismatch(self) -> None:
         # Modify targets contents without updating
         # snapshot's targets hashes
         self.sim.targets.version += 1
-        self.sim.snapshot.meta[
-            "targets.json"
-        ].version = self.sim.targets.version
+        self.sim.snapshot.meta["targets.json"].version = (
+            self.sim.targets.version
+        )
         self.sim.snapshot.version += 1
         self.sim.update_timestamp()