Investigate replacing API token with Trusted Publisher configuration

[seifertm]

The PyPI Upload step in the Deploy job of the CI pipeline currently uses an API token to upload packages to PyPI. The CI step emits the following warning:

Warning: Trusted Publishers allows publishing packages to PyPI from automated environments like GitHub Actions without needing to use username/password combinations or API tokens to authenticate with PyPI. Read more: https://docs.pypi.org/trusted-publishers

It is to be decided whether the API token should be kept or PyPI should be configure to trust the GitHub OIDC token, instead.