[manila] Release 7.4.0 off of stable/rocky

This minor release includes bug-fixes for:

- bug #1634278
- bug #1678524
- bug #1634734
- bug #1795463
- bug #1796986
- bug #1700871
- bug #1845135

These bug-fixes affect the public API of the
Shared File Systems service, but introduce
no backwards incompatible changes that affect
the client negatively.

Change-Id: I8d735a5f9e393b80f2944b42b6b3517d423e3a89

deliverables/rocky/manila.yaml

@@ -37,6 +37,10 @@ releases:
       - hash: 705ad2dada23ab22aa076fabe8c0744f19588e2f
         repo: openstack/manila
     version: 7.3.0
+  - projects:
+      - hash: 7543bd8bdeb42315b2cc61401e4c7ae4410c8fec
+        repo: openstack/manila
+    version: 7.4.0
 repository-settings:
   openstack/manila: {}
 branches: