chore(sdk): update outpost-go shields.json to version v0.4.0

Author: github-actions[bot]

sdks/outpost-go/shields.json

@@ -1,6 +1,6 @@
 {
   "schemaVersion": 1,
   "label": "outpost-go",
-  "message": "v0.3.0",
+  "message": "v0.4.0",
   "color": "blue"
 }