Release keystoneauth for Antelope-2 milestone

This is a library release for keystoneauth for the Antelope-2
milestone. This repository contains commits that have not been releases
for this cycle yet.

If the team is ready to process with this release, please leave a +1
to indicate we should go ahead with the release.

If the team needs more time for things about to merge, or if there is
some other reason a release should not be done at this time, please
leave a -1 with a comment indicating the status. Then update the patch
with the new commit hash to use once the team is ready to do the
release.

$ git log --oneline --no-merges 5.1.0..c96b058
5098d45 Allow passing of version header
ae646f8 Enforce scope mutual exclusion for system
11faa0e Fix linters and bindep on jammy

Change-Id: I9c3d842f9f1bdb1f6ce743bfbece03f04545a9ac

deliverables/antelope/keystoneauth.yaml

@@ -12,3 +12,7 @@ releases:
     projects:
       - repo: openstack/keystoneauth
         hash: aa9c5d230f48c0ca4a4fb5dde6c92a07aab287e0
+  - version: 5.1.1
+    projects:
+      - repo: openstack/keystoneauth
+        hash: c96b058212865804ad29eb7461328f87ea874e9e