Trigger OSS => ENT merge for all release branches (#17853)

Previously, this only triggered for release/*.*.x branches; however, our release process involves cutting a release/1.16.0 branch, for example, at time of code freeze these days. Any PRs to that branch after code freeze today do not make their way to consul-enterprise. This will make behavior for a .0 branch consistent with current behavior for a .x branch.

.github/workflows/oss-merge-trigger.yml

@@ -8,7 +8,7 @@ on:
       - closed
     branches:
       - main
-      - 'release/*.*.x'
+      - release/**
 
 jobs:
   trigger-oss-merge: