chore(deps): update dependency python-keystoneclient to v5.7.0

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

Author: renovate[bot]

Pipfile

@@ -13,7 +13,7 @@ pymysql = "==1.1.1"
 python-cinderclient = "==9.7.0"
 python-dateutil = "==2.9.0.post0"
 python-glanceclient = "==4.8.0"
-python-keystoneclient = "==5.6.0"
+python-keystoneclient = "==5.7.0"
 python-neutronclient = "==11.4.0"
 python-novaclient = "==18.9.0"
 python-octaviaclient = "==3.10.0"