use correct branch when calling action

Author: 0marperez

.github/workflows/merge-main.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Merge main
-        uses: awslabs/aws-kotlin-repo-tools/.github/actions/merge-main@auto-merge
+        uses: awslabs/aws-kotlin-repo-tools/.github/actions/merge-main@fix-auto-merge
         # TODO: Use main instead of feature branch ^
         with:
           exempt-branches: # Add any if required