Increased amount of saved jenkins gating jobs

Change-Id: Ia8ef93dcc5133cfbb7bb3363a8f8be0535b40e8b
diff --git a/jenkins/client/job/gating.yml b/jenkins/client/job/gating.yml
index d0f2149..db2033e 100644
--- a/jenkins/client/job/gating.yml
+++ b/jenkins/client/job/gating.yml
@@ -25,9 +25,9 @@
           template:
             discard:
               build:
-                keep_num: 5
+                keep_num: 25
               artifact:
-                keep_num: 5
+                keep_num: 25
             type: workflow-scm
             concurrent: true
             scm: