Updated rest-api-spec action (#954)

Author: delvedor

.github/workflows/update-rest-api-json.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        branch: ['main', '7.x', '7.14', '7.15']
+        branch: ['main', '7.15', '7.16']
 
     steps:
       - uses: actions/checkout@v2