Update setup.yaml

Signed-off-by: John Osborne <josborne@chainguard.dev>

Author: johnfosborneiii

.github/workflows/setup.yaml

@@ -7,7 +7,7 @@ on:
     - '.github/workflows/setup.yaml'
 
 env:
-  ULTRALYTICS_SOURCE: "PYPI"
+  ULTRALYTICS_SOURCE: "CHAINGUARD"
 
 permissions: {}