Release v0.0.403

Update CI workflow and refactor example methods for clarity

- Modified the GitHub Actions workflow to check formatting and linting specifically for the `./src` and `./spec` directories.
- Refactored the `ExampleRunner` class to simplify availability checks for Redis, Postgres, and SQLite by removing unnecessary begin-rescue blocks.
- Updated caching methods in `active_record_cache_demo.cr` to use block syntax for better readability.