fix: Improve CI configuration and documentation

fix: Improve CI configuration and documentation This commit addresses several issues to improve the CI workflow and documentation: - **CI Workflow (`.github/workflows/ci.yml`):** - Removed redundant `milliseconds` input for the `test-action` job. - Added `php-version: 8.4` to the `test-action` job, ensuring compatibility with PHP 8.4 for testing purposes. - **Documentation (`README.md`):** - Corrected "Github" to "GitHub" for proper capitalization. - Updated wording to "Drupal codebase" for consistency. - Ensured code formatting for registry options (`ghcr` and `dockerhub`). - Clarified that `grumphp run` is executed on the "codebase". - Clarified that `phpstan` is run on the "codebase". - **Dependencies (`package.json`):** - Added `engines.node` to specify a minimum Node.js version of 24.0.0, ensuring compatibility with newer Node.js features used by the action.