Release sahara-plugin-vanilla RC1 for Antelope

This proposed a RC1 release for sahara-plugin-vanilla to get any merged changes
out prior to the RC1 deadline for Antelope going into effect.

If the team is ready to proceed, please leave a +1 to acknowledge this
release and we will process right away. If the team is working on any
final merges, leave a -1 with some detail on the status and update the
patch with the new commit hash to use when ready.

Patches with no response will be merged by early Friday, March 03.

$ git log --oneline --no-merges 8.0.0..d93365f
d93365f Dropping lower constraints testing and remove py36,py37 support

Signed-off-by: Hervé Beraud <hberaud@redhat.com>
Change-Id: Ifadb31072c6b9a35c71da6ca31932b24c992a6a9

deliverables/antelope/sahara-plugin-vanilla.yaml

@@ -5,3 +5,11 @@ team: sahara
 type: other
 repository-settings:
   openstack/sahara-plugin-vanilla: {}
+releases:
+  - version: 9.0.0.0rc1
+    projects:
+      - repo: openstack/sahara-plugin-vanilla
+        hash: d93365f15187ddb0f618317ad6a1d45d700acef5
+branches:
+  - name: stable/2023.1
+    location: 9.0.0.0rc1