Toggle allowing invalid package name chars

[CasperWA]

While mostly not a desired thing, in some cases it would be good to be able to allow otherwise invalid characters for package names for the hooks and callable workflows that try to update the dependencies in a pyproject.toml file.

This issue was first reported in a cookiecutter template repository: EMMC-ASBL/oteapi-plugin-template#205, where the package name is a cookiecutter variable, i.e., of the type {{ cookiecutter.some_variable }}.