Release oslo.service 1.31.7

A previous patch replaced the _Event() function and _
ThreadingEvent() class in oslo_service.loopingcall
with a single _Event() class. However, some consumers of
oslo_service (including Nova) were relying on the private
interface to mock methods during unit testing,
which prevents them updating to the latest version of oslo.service.

$ git log --no-merges 1.31.6.. --oneline
d555763 Maintain private interface for loopingcall._ThreadingEvent

Change-Id: I2b33c33b739f15742b7762379581d19da42b6475

deliverables/rocky/oslo.service.yaml

@@ -41,6 +41,10 @@ releases:
       - hash: 6566ec5e4b143f47a835223e5bcbe68766c52f7a
         repo: openstack/oslo.service
     version: 1.31.6
+  - projects:
+      - hash: d555763f8f2fd56ae3e11990d095a52097e452f4
+        repo: openstack/oslo.service
+    version: 1.31.7
 branches:
   - location: 1.31.3
     name: stable/rocky