Bump hacking

hacking 3.0.x is too old.

Also, fixtures appears in both requirements and test-requirements.
Because this library is only used in oslo_service.fixtures for testing,
we can remove it from runtime requirements.

Change-Id: Iaf57598a73af62e07e890245dc51c9af6a807bd7

.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

@@ -1,11 +1,6 @@
-# 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.
-
 WebOb>=1.7.1 # MIT
 debtcollector>=1.2.0 # Apache 2.0
 eventlet>=0.25.2 # MIT
-fixtures>=3.0.0 # Apache-2.0/BSD
 greenlet>=0.4.15 # MIT
 oslo.utils>=3.40.2 # Apache-2.0
 oslo.concurrency>=3.25.0 # Apache-2.0

test-requirements.txt

@@ -1,9 +1,5 @@
-# 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.
-
 fixtures>=3.0.0 # Apache-2.0/BSD
-hacking>=3.0.1,<3.1.0 # Apache-2.0
+hacking>=6.1.0,<6.2.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0