Bump hacking

hacking 2.0.x or 3.0.x is too old.

Change-Id: If6b2d64febbf00814503eccd59dd9dadd330e0ba

.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$'

requirements.txt

@@ -1,7 +1,3 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
 pbr>=3.1.1 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=2.21.0 # Apache-2.0

test-requirements.txt

@@ -1,8 +1,4 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
-hacking>=2.0.0,<2.1.0 # Apache-2.0
+hacking>=6.1.0,<6.2.0 # Apache-2.0
 
 stestr>=2.0.0 # Apache-2.0
 testtools>=2.3.0 # MIT