Template Python version in two more files

### Provide a general description of the issue or problem.

Not sure if these should be have the package min python version templated?

https://github.com/sunpy/package-template/blob/main/%7B%7B%20cookiecutter.package_name%20%7D%7D/.rtd-environment.yml
https://github.com/sunpy/package-template/blob/main/%7B%7B%20cookiecutter.package_name%20%7D%7D/.ruff.toml