Update sync-readme-changelog.yml

Author: nsingh-branch

.github/workflows/sync-readme-changelog.yml

@@ -40,7 +40,7 @@ jobs:
             --data "$payload"
 
         # Escape newlines for Slack payload
-        release_body_escaped=$(echo -n "$release_body" | sed ':a;N;$!ba;s/\n/\\n/g')
+        release_body_escaped=$(echo -n "${{ github.event.release.body }}" | sed ':a;N;$!ba;s/\n/\\n/g')
         echo "release_body_escaped=$release_body_escaped" >> "$GITHUB_OUTPUT"
 
     - name: Announce New Release in Slack