Log Message:
cad/py-PyRTL: Update to 0.11.1

Changelog:
0.11.1:
Upgrade download-artifact action to v4, for compatibility with upload

-artifact v4.

0.11.0:
Set PyRTL's Python package version from `git tag`.

This avoid keeping the latest version number in two places, `pyproject.toml`
and `git tag`. Simplify instructions in release/README.md.

Rename some GitHub workflow jobs to clarify their purpose.

0.11.0rc1:
GitHub actions to automate PyRTL releases to TestPyPI and PyPI.

- Migrade from `setup.{py,cfg}` to `pyproject.toml`
- Add `python-release.yml` workflow
- Prepare a `0.11.0rc1` release.
- Rename `python-package.yml` to `python-test.yml` and upgrade checkout action \ 
to `v4`.
- Add release documentation at `release/README.md`
- Use latest python and ubuntu versions for readthedocs.
- Remove the release version number from the sphinx configuration
  (`docs/conf.py`). It doesn't seem to do anything.