Cache using hash from pyproject.toml instead of setup.py

[rffontenelle]

setup.py was removed in 42aa5a5.

Also updates actions/cache version to solve the warning in GitHub Actions workflow run:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/cache@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.