Run onos-2.7 on Saturdays

Change-Id: I90bdd0373262395328632d354d60ba83d64fab8f
diff --git a/TestON/JenkinsFile/dependencies/branches.json b/TestON/JenkinsFile/dependencies/branches.json
index e03ba04..84e6a72 100644
--- a/TestON/JenkinsFile/dependencies/branches.json
+++ b/TestON/JenkinsFile/dependencies/branches.json
@@ -1,6 +1,6 @@
 {
     "latest_branches": {
-        "onos-LTS1": "2.5",
+        "onos-LTS1": "2.7",
         "onos-LTS2": "2.5"
     },
     "support_branches": {