Bump hacking (again)

The previous attempt did not update the version in pre commit config
so the old version is still used by pep8 target.

Change-Id: I62048df659f4bc35f714de824aadfe9306e81c71

.pre-commit-config.yaml

@@ -32,7 +32,7 @@ repos:
       - id: flake8
         name: flake8
         additional_dependencies:
-          - hacking>=3.0.1,<3.1.0
+          - hacking>=6.1.0,<6.2.0
         language: python
         entry: flake8
         files: '^.*\.py$'

oslo_config/tests/test_sources.py

@@ -308,7 +308,7 @@ class URISourceTestCase(base.BaseTestCase):
         # testing driver loading
         self.assertEqual(self.conf._sources, [])
         self.conf._load_alternative_sources()
-        self.assertEqual(type(self.conf._sources[0]),
+        self.assertIsInstance(self.conf._sources[0],
                               _uri.URIConfigurationSource)
 
         source = self.conf._open_source_from_opt_group(group)