Release networking-ovn for stable/train

This release picks up new commits to networking-ovn since
the last release from stable/train.

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.

Signed-off-by: Elod Illes <elod.illes@est.tech>
Change-Id: Id029fed75a72858eec9d983bb015007c144c96b3

deliverables/train/networking-ovn.yaml

@@ -44,6 +44,10 @@ releases:
     projects:
       - repo: openstack/networking-ovn
         hash: 9f0cc76d8f63fca84b9da77da3d38046a4010bae
+  - version: 7.4.0
+    projects:
+      - repo: openstack/networking-ovn
+        hash: 14b2f76ff7021a017e73ad7cc8f97b9e6a4b40c5
 branches:
   - name: stable/train
     location: 7.0.0.0rc1