fix: build orders & payment images

Neither orders and payment MFE images were building successfully because
they were targeting the default release tag, which was
open-release/sumac.1. Given that this tag was not added to the upstream
repositories, build was failing. Here, we resolve this issue by
targeting open-release/sumac.master, just like we do for the ecommerce
and ecommerce-worker repositories.

tutorecommerce/plugin.py

@@ -73,10 +73,12 @@ def _add_ecommerce_mfe_apps(
         {
             "orders": {
                 "repository": "https://github.com/openedx/frontend-app-ecommerce.git",
+                "version": "open-release/sumac.master",
                 "port": 7296,
             },
             "payment": {
                 "repository": "https://github.com/openedx/frontend-app-payment.git",
+                "version": "open-release/sumac.master",
                 "port": 1998,
             },
         }