Bump hacking to 6.1.0

When using hacking 3.x on a Python 3.12 environment,
tox -e pep8 fails with:

./cinder_tempest_plugin/rbac/v3/test_volume_types.py:118:51:
 E713 test for membership should be 'not in'
 message=f"Key '{self.extra_spec_key}' not found in extra_specs."

Moving to a newer version of hacking fixes this.

Change-Id: I44d48223e1ad5cc8f8c7343b97e3328e353cf119
1 file changed