fix syntax

Author: GitHub Copilot

.github/workflows/auto-update-pr-branches.yaml

@@ -42,8 +42,7 @@ jobs:
               if [ "$merge_state" = "BEHIND" ]; then
                 echo "PR #$pr is behind main, triggering Dependabot rebase"
                 gh pr comment --repo "${{ github.repository }}" "$pr" --body "@dependabot rebase" || true
-              else
-              if [ "$merge_state" = "UNKNOWN" ]; then
+              elif [ "$merge_state" = "UNKNOWN" ]; then
                 echo "PR #$pr state UNKNOWN, triggering Dependabot rebase anyway to be safe"
                 gh pr comment --repo "${{ github.repository }}" "$pr" --body "@dependabot rebase" || true
               else