Increase number of concurrent jobs

Change-Id: I987710524cc8d5d4487fc50549d805077b9ab936
diff --git a/jenkins/client/job/salt-formulas/tests.yml b/jenkins/client/job/salt-formulas/tests.yml
index 5fb4440..448c421 100644
--- a/jenkins/client/job/salt-formulas/tests.yml
+++ b/jenkins/client/job/salt-formulas/tests.yml
@@ -160,7 +160,7 @@
                 type: text
               PARALLEL_GROUP_SIZE:
                 type: string
-                default: "4"
+                default: "8"
       job:
         test-salt-formulas-env:
           name: test-salt-formulas-env