removed v1beta3 branch from github workflow

Author: NoaheCampbell

.github/workflows/build-test.yaml

@@ -3,9 +3,9 @@ name: build-test
 on:
   pull_request:
     types: [opened, reopened, synchronize, ready_for_review]
-    branches: [v1beta3]
+    branches: [main]
   push:
-    branches: [v1beta3]
+    branches: [main]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}