Show outdated pip dependencies in `pyproject.toml`.

Follow these steps:

1. **Run the check script.** Execute `python .github/scripts/check_outdated_deps.py check` from the project root. This queries PyPI for every `~=` pinned dependency and outputs a JSON list of outdated packages.

2. **Display the results.** Parse the JSON output and present a readable table with columns: Package, Current Version, Latest Version. Sort by package name.

3. **Summarize.** Report the total number of outdated packages vs total `~=` pinned packages. If nothing is outdated, say so.
