[Fix gate]Update test requirement

Since pbr already landed and the old version of hacking seems not
work very well with pbr>=2, we should update it to match global
requirement.
Partial-Bug: #1668848

Change-Id: I07b1fbf01f96c024b25178e42a4dd566b905c103
diff --git a/test-requirements.txt b/test-requirements.txt
index 844d32c..936d5aa 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 # 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<0.13,>=0.12.0 # Apache-2.0
+hacking>=0.12.0,!=0.13.0,<0.14  # Apache-2.0
 # needed for doc build
 sphinx>=1.5.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0