CI impacts due to new ruaml.yaml release

Hi Folks, `ruaml.yaml` in it's latest release `0.19.0` just a day ago switched their underlying c implemention from `ruaml.yaml.clib` to `ruaml.yaml.clibz` package. https://pypi.org/project/ruamel.yaml.clib/#files (has wheels) https://pypi.org/project/ruamel.yaml.clibz/#files (only source distribution / no wheels) The later unfortunately does not have any wheels built, suddenly causing issues in CI due to missing build dependencies. Trying to raise an issue on their project, but not very straight forward due to using sourceforge https://sourceforge.net/p/ruamel-yaml-clibz/code/ci/default/tree/ Could you in the meantime consider limiting the dependency to ``` install_requires = ruamel.yaml>=0.15,<0.19 ``` Trying in the meantime to mess around with `additional_dependencies`, however likely will run into similar fate as https://github.com/pre-commit/pre-commit/issues/2386