chore: update Radius plugin to 0.2.1 (#4538)

Signed-off-by: Mike Azure <127820851+AzureMike@users.noreply.github.com>

plugins/external.json

@@ -1341,7 +1341,7 @@
   {
     "name": "radius",
     "description": "Model, visualize, and deploy applications with Radius from the GitHub Copilot app and CLI.",
-    "version": "0.2.0",
+    "version": "0.2.1",
     "author": {
       "name": "Radius",
       "url": "https://radapp.io"
@@ -1362,8 +1362,8 @@
       "source": "github",
       "repo": "radius-project/ai-extensions",
       "path": "plugins/radius",
-      "ref": "radius@0.2.0",
-      "sha": "ffa3c1eb0bda0d288005162955dedc0d48b1ec30"
+      "ref": "radius@0.2.1",
+      "sha": "708a3396a3f69f2ace39525a52b9fd9da92d6001"
     }
   },
   {