Release sushy for stable/xena

This release picks up new commits to sushy since
the last release from stable/xena.

This is being proposed as a convenience to help make sure stable
changes are being released. If the team is good with this going out,
please respond with a +1 to let the release team know it is OK to
proceed.

If it is not wanted at this time, or if there are more changes that
would be good to get merged before doing a stable release, please
leave a -1 with a comment with what the team would prefer. We can
then either abandon this patch, or wait for an update with a new
commit hash to use instead.

$ git log --oneline --no-merges 3.12.5..5d89e41
3765efc Fix tox4 and setuptools errors
be95c7c Retry on iDRAC SYS518 errors for all requests
a20ecdd Handle a different error code for missing TransferProtocolType

Signed-off-by: Hervé Beraud <hberaud@redhat.com>
Change-Id: If5e57dce782408af974c80cf1db0c209847aae1c

deliverables/xena/sushy.yaml

@@ -54,6 +54,10 @@ releases:
     projects:
       - repo: openstack/sushy
         hash: 42effa17c989bb8f1f425e769f9242d4b8f9780b
+  - version: 3.12.6
+    projects:
+      - repo: openstack/sushy
+        hash: e71373c5a740d905cedec7c5d4cb44010fb9d115
 branches:
   - name: stable/xena
     location: 3.12.0