fix: made some changes in fetching branch details.

Author: rahul-infra

.github/workflows/release-preview.yaml

@@ -31,7 +31,7 @@ jobs:
       - name: Setup preview config
         run: |
           # Update preview config with the PR branch name
-          sed -i.bak "s/BRANCH_PLACEHOLDER/${{ github.event.pull_request.head.ref }}/g" .preview-releaserc.json
+          sed -i.bak "s|BRANCH_PLACEHOLDER|${{ github.event.pull_request.head.ref }}|g" .preview-releaserc.json
           rm .preview-releaserc.json.bak
 
       - name: Run semantic-release (dry-run)