bump copilot plugin, give better error message for copilot (#4678)

packages/opencode/src/provider/transform.ts

@@ -272,4 +272,12 @@ export namespace ProviderTransform {
 
     return schema
   }
+
+  export function error(providerID: string, message: string) {
+    if (providerID === "github-copilot" && message.includes("The requested model is not supported")) {
+      message +=
+        "\n\nMake sure the model is enabled in your copilot settings: https://github.com/settings/copilot/features"
+    }
+    return message
+  }
 }