Merge pull request #738 from rackerlabs/renovate/python-keystoneclient-5.x

chore(deps): update dependency python-keystoneclient to v5.6.0

Author: cardoe

ironic-images/requirements.txt

@@ -1,4 +1,4 @@
 diskimage-builder==3.37.0
 ironic-python-agent-builder==6.0.0
-python-keystoneclient==5.5.0
+python-keystoneclient==5.6.0
 python-swiftclient==4.7.0