Keep publiccode.yml up to date

We can use a tool like https://github.com/mbarkhau/bumpver/ or https://github.com/callowayproject/bump-my-version/ to keep same versions in [pyproject.toml](https://github.com/openfisca/openfisca-core/blob/master/pyproject.toml) and [publiccode.yml](https://github.com/openfisca/openfisca-core/blob/master/publiccode.yml).