[magnum-tempest-plugin] Tag zed-last

Zed branch is moving to unmaintained state now[1]. Tempest and tempest
plugins are branchless which means master version of Tempest and
its plugins is used to test the supported stable branches.

Once any stable branch is moved to unmaintained state then, Tempest and
its plugins compatible tag[2][3] needs to be released which can be used
to test the unmaintained stable branches.

Tagging 'zed-last' as well as a new version with latest hash.

[1] https://review.opendev.org/q/topic:%22zed-unmaintained%22
[2] https://docs.openstack.org/tempest/latest/stable_branch_support_policy.html
[3] https://docs.openstack.org/tempest/latest/tempest_and_plugins_compatible_version_policy.html

Change-Id: I29e8a4264a1446fbb9954839e9e1c2b7b8c60dbd

deliverables/dalmatian/magnum-tempest-plugin.yaml

@@ -9,3 +9,8 @@ repository-settings:
     tarball-base: magnum_tempest_plugin
 team: magnum
 type: tempest-plugin
+releases:
+  - version: 2.4.0
+    projects:
+      - repo: openstack/magnum-tempest-plugin
+        hash: b3c601735b662da421a160212c2d877d9b6172e8

deliverables/zed/magnum-tempest-plugin.yaml

@@ -14,3 +14,7 @@ releases:
     projects:
       - repo: openstack/magnum-tempest-plugin
         hash: 62c83d376b9c74ca5a48218eca4ed99921004ba4
+  - version: zed-last
+    projects:
+      - repo: openstack/magnum-tempest-plugin
+        hash: b3c601735b662da421a160212c2d877d9b6172e8