### Summary

Our setuptools constrain in `pyproject.toml` (listed also in `setup.cfg`) is set to `>= 39.2.0` due to the minimum version available at the time on Ubuntu 18.04.

Now that we have a dependency on Python 3.9 as a minimum, that constraint no longer makes sense, as Python 3.9 is not available on 18.04, and the `dist-packages` `setuptools==39.2.0` compat between deadsnakes python3.9 is non-functional.

This would make Ubuntu 20.04 effectively the minimum supported controller.  The `dist-packages` `setuptools==45.2.0` is functional with the `python3.9` package, and works fine with our packaging.  

This doesn't really grant us anything, since we're waiting for the minimum to eventually be `51.0.0` so we can list the `entry_points` in `pyproject.toml`, but no need to list effectively a non-functional lower bounds. 

### Issue Type

Feature Idea

### Component Name

pyproject.toml

### Additional Information

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)

```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
"""Untar the sdist"""
    
    with tarfile.open(os.path.join(tmp_dir, sdist_path), 'r|*') as sdist:
        sdist.extractall(path=tmp_dir)
    
    sdist_filename = os.path.basename(sdist_path)
    tmp_dir_files = os.listdir(tmp_dir)
    try:
        tmp_dir_files.remove(sdist_filename)
    except ValueError:
        
        raise
    if len(tmp_dir_files) > 1:
        raise Exception('Unexpected extra files in the temp dir')
    elif len(tmp_dir_files) < 1:
        raise Exception('sdist extraction did not occur i nthe temp dir')
    return os.path.join(tmp_dir, tmp_dir_files[0])
def install_sdist(tmp_dir, sdist_dir):