Update pypi-ci.yml

[Giulero]

This PR should fix https://github.com/ami-iit/adam/actions/runs/11518056399, which gives the following:

You are using `pypa/gh-action-pypi-publish@master`. The `master` branch of this project has been sunset and will not receive any updates, not even security bug fixes. Please, make sure to use a supported version. If you want to pin to v1 major version, use `pypa/gh-action-pypi-publish@release/v1`. If you feel adventurous, you may opt to use use `pypa/gh-action-pypi-publish@unstable/v1` instead. A more general recommendation is to pin to exact tags or commit SHAs.

Following https://github.com/marketplace/actions/pypi-publish#trusted-publishing I updated the logic of the pypi workflow.

The CI seems to work now.

[Giulero]

Thanks @traversaro ! :)