Bump hacking to 3.1.0
# 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,<3.1.0 # Apache-2.0
+hacking>=3.1.0,<3.2.0 # Apache-2.0
coverage!=4.4,>=4.1 # Apache-2.0
ddt>=1.0.1 # MIT
oslotest>=3.2.0 # Apache-2.0
