GitHub Pages deployment action bumped to v5

The GitHub Pages deployment action is now running version 5. Dependabot opened this automated PR to keep the deployment workflow current with the latest major release. Version 5 updates the underlying Node.js runtime to 24.x and includes several improvements to how the action handles Dependabot interactions and error reporting. Keeping CI actions on current versions helps avoid compatibility issues and ensures access to the latest fixes and optimizations. This change lives in the publish.yaml workflow that handles deployment to GitHub Pages.