fix: set cancel-in-progress to true for pages deployment

- Change cancel-in-progress from false to true in concurrency settings
- Ensures only the latest commit is deployed by cancelling older deployments
- Follows GitHub Pages deployment best practices
- Saves runner minutes and avoids deploying outdated code

Author: yibeichan

{{cookiecutter.protocol_name}}/.github/workflows/deploy-gh-pages.yml

@@ -19,7 +19,7 @@ permissions:
 
 concurrency:
   group: "pages"
-  cancel-in-progress: false
+  cancel-in-progress: true
 
 jobs:
   build: