Release puppet-designate 15.5.0 for Train

We need to release 15.5.0 instead of 15.4.0
for Train because we had broken code in that
release since Designate has removed the
pool-manager [1].

We fixed our testing in [2] and deprecated
that code and added a release note in [3].

See the release patch that updates the
metadata [4] which holds the complete
patch chain.

[1] https://docs.openstack.org/releasenotes/designate/train.html
[2] https://review.opendev.org/#/c/687247/
[3] https://review.opendev.org/#/c/687333/
[4] https://review.opendev.org/#/c/687334

Depends-On: https://review.opendev.org/#/c/687334
Change-Id: I72ddf92837bfd99beb4279afabf57bb84c7792fe

deliverables/train/puppet-designate.yaml

@@ -22,6 +22,10 @@ releases:
     projects:
       - repo: openstack/puppet-designate
         hash: 3dbfcae680f973bbe0d0d02ee9d7e95bb6ae284f
+  - version: 15.5.0
+    projects:
+      - repo: openstack/puppet-designate
+        hash: 0543a1c2a0108fb7b67c41e6bc2fbad99eb24cb9
 branches:
   - name: stable/train
     location: 15.4.0