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
diff --git a/test-requirements.txt b/test-requirements.txt
index 905ad51..cb279bc 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
# of appearance. Changing the order has an impact on the overall integration
# process, which may cause wedges in the gate later.
-hacking>=3.0.1,<3.1 # Apache-2.0
+hacking>=6.1.0,<7.0 # Apache-2.0
coverage!=4.4,>=4.0 # Apache-2.0
python-subunit>=1.0.0 # Apache-2.0/BSD