Raise min of oslo.policy to 3.8.1
All the tests added recently to cinder/tests/unit/policies were
validated using oslo.policy 3.8.1 (tagged on 2021-06-15), so it
would be wise to require at least that release for use with cinder.
@@ -21,7 +21,7 @@ oslo.db>=8.4.0 # Apache-2.0
oslo.log>=4.5.0 # Apache-2.0
oslo.messaging>=12.5.0 # Apache-2.0
oslo.middleware>=4.1.1 # Apache-2.0
-oslo.policy>=3.6.2 # Apache-2.0
+oslo.policy>=3.8.1 # Apache-2.0
oslo.privsep>=2.4.0 # Apache-2.0
oslo.reports>=2.2.0 # Apache-2.0
oslo.rootwrap>=6.2.0 # Apache-2.0
