fix unused var and replace deprecated datetime.utcnow

Author: dylanjew

src/appengine/handlers/fuzzers.py

@@ -195,7 +195,8 @@ def apply_fuzzer_changes(self, fuzzer, upload_info):
     fuzzer.external_contribution = bool(external_contribution)
     fuzzer.differential = bool(differential)
     fuzzer.additional_environment_string = environment_string
-    fuzzer.timestamp = datetime.datetime.utcnow()
+    fuzzer.timestamp = datetime.datetime.now(tz=datetime.timezone.utc).replace(
+        tzinfo=None)
     fuzzer.data_bundle_name = data_bundle_name
 
     # Update only if a new archive is provided.

src/clusterfuzz/_internal/tests/appengine/handlers/fuzzers_test.py

@@ -103,7 +103,6 @@ def test_create_fuzzer(self):
     self.mock.apply_fuzzer_changes.assert_called_once()
 
     fuzzer = self.mock.apply_fuzzer_changes.call_args[0][1]
-    upload_info = self.mock.apply_fuzzer_changes.call_args[0][2]
 
     self.assertEqual(fuzzer.name, fuzzer_name)
     self.assertEqual(fuzzer.revision, 0)