Update model to use test SA connection "gcc-internal"

Change-Id: I2151c1a9cb9a2893c44f327a7dbc98f1afacec7d

hdeist-test-model.model.lkml

diff --git a/hdeist-test-model.model.lkml b/hdeist-test-model.model.lkml
index 560cb30..783f7df 100644
--- a/hdeist-test-model.model.lkml
+++ b/hdeist-test-model.model.lkml
@@ -1,5 +1,5 @@
 
-connection: "concord"
+connection: "gcc-internal"
 
 include: "explores/*.view.lkml"