update release-release-drafter (#824)

- to `main` branch

Author: vslee

.github/workflows/release-drafter.yml

@@ -4,7 +4,7 @@ on:
   push:
     # branches to consider in the event; optional, defaults to all
     branches:
-      - master
+      - main
   # pull_request event is required only for autolabeler
   pull_request:
     # Only following types are handled by the action, but one can default to all as well