Increased jenkins gating jobs build retention policy

Change-Id: Ica98c8ca14e5c412e9241dbe50f188f3ce5c950c
diff --git a/jenkins/client/job/gating.yml b/jenkins/client/job/gating.yml
index f9e9b1a..1ed093e 100644
--- a/jenkins/client/job/gating.yml
+++ b/jenkins/client/job/gating.yml
@@ -25,9 +25,9 @@
           template:
             discard:
               build:
-                keep_num: 25
+                keep_num: 150
               artifact:
-                keep_num: 25
+                keep_num: 150
             type: workflow-scm
             concurrent: true
             scm: