Update devcontainer.json

.devcontainer/devcontainer.json

 {
-    "image":"mcr.microsoft.com/devcontainers/universal:2",
-    "features": {
-        "ghcr.io/devcontainers/features/python:1": {
-            "version": "3.9"
-        }
-    }
+    "image":"mcr.microsoft.com/devcontainers/python:0-3.9"
 }