chore(deps): update dependency python-novaclient to v18.13.1 (#2659)

Signed-off-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

requirements.openstackclient.txt

@@ -17,7 +17,7 @@ python-manilaclient==6.2.0
 python-masakariclient==8.9.0
 python-mistralclient==6.3.0
 python-neutronclient==14.0.0
-python-novaclient==18.13.0
+python-novaclient==18.13.1
 python-octaviaclient==3.15.0
 python-swiftclient==4.10.0
 python-troveclient==8.10.0