Bump hacking

hacking 3.0.x is too old. Bump it to the version currently used in
tempest repo.

Also remove the note about old pip's behavior because recent pip does
not require specific order.

Depends-on: https://review.opendev.org/c/openstack/tempest/+/906634
Change-Id: I9a7760dcbcba15213deaa03e3c2a5f42446905d1
diff --git a/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py b/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py
index a3cf76d..c1a1807 100644
--- a/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py
+++ b/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py
@@ -157,7 +157,7 @@
         This test must check
           * whether the persona can delete a policy association for a region
             and service
-        """
+        """  # noqa: E501
         pass
 
 
diff --git a/keystone_tempest_plugin/tests/scenario/keycloak.py b/keystone_tempest_plugin/tests/scenario/keycloak.py
index 50c3495..ef2b01d 100644
--- a/keystone_tempest_plugin/tests/scenario/keycloak.py
+++ b/keystone_tempest_plugin/tests/scenario/keycloak.py
@@ -26,7 +26,7 @@
 
     @property
     def url_base(self):
-        return self.keycloak_url + f'/admin/realms'
+        return self.keycloak_url + '/admin/realms'
 
     @property
     def token_endpoint(self):
diff --git a/requirements.txt b/requirements.txt
index 67f303d..24faa8c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +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.
+# Requirements lower bounds listed here are our best effort to keep them up to
+# date but we do not test them so no guarantee of having them all correct. If
+# you find any incorrect lower bounds, let us know or propose a fix.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 9c7d865..3d2e1c5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1 @@
-# 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>=3.0,<3.1.0;python_version>='3.5' # Apache-2.0
+hacking>=6.1.0,<6.2.0 # Apache-2.0