Update repo-sync.yml

Author: lauradreith

.github/workflows/repo-sync.yml

@@ -20,6 +20,7 @@ jobs:
     - uses: repo-sync/pull-request@v2
       name: Create pull request
       with:
+        exclude: '.github/workflows/repo-sync.yml'
         source_branch: ${{ secrets.INTERMEDIATE_BRANCH }}
         destination_branch: main
         github_token: ${{ secrets.REPO_SYNC }}