Update description to post release PR

.github/workflows/post_release_version_bump.yml

@@ -49,9 +49,11 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           DEV_VERSION="${{ github.event.inputs.version }}.dev0"
-          gh pr create --title "Prepare main for next development cycle: Update version to $DEV_VERSION" \
+          gh pr create --title "Post release $VERSION: Update version to $DEV_VERSION" \
                        --body "This PR prepares the main branch for the next development cycle by updating the version to $DEV_VERSION.
           
+          This PR should only be merge when release for version v$VERSION is success.
+          
           By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice." \
                        --head prepare-main-for-next-dev-cycle-${VERSION} \
                        --base main