Analysis with 0.9.7 fails with `cannot import name 'Feature' from 'setuptools'`

Running the python-inspector on [this requirements.txt](https://github.com/oss-review-toolkit/ort/blob/main/plugins/package-managers/python/src/funTest/assets/projects/synthetic/python-inspector/requirements.txt), fails with the following error.

The same project can successfully be analyzed using python-inspector 0.9.6.

The command I used is:
```
python-inspector --python-version 310 --operating-system linux --json-pdt result.json --analyze-setup-py-insecurely --requirement requirements.txt --verbose
```

```
Warning: ambiguous setup provider in /Volumes/src/oss/ort/plugins/package-managers/python/src/funTest/assets/projects/synthetic/python-inspector/.cache/python_inspector/extracted_sdists/itsdangerous-0.24/itsdangerous-0.24/setup.py: candidates are ['setuptools', 'distutils.core']defaulting to 'distutils.core'.
Traceback (most recent call last):
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/resolve_cli.py", line 247, in resolve_dependencies
resolution_result: Dict = resolver_api(
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/api.py", line 263, in resolve_dependencies
resolution, purls = resolve(
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/api.py", line 322, in resolve
resolved_dependencies, packages = get_resolved_dependencies(
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/api.py", line 360, in get_resolved_dependencies
resolver_results = resolver.resolve(requirements=requirements, max_rounds=max_rounds)
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/resolvelib/resolvers.py", line 546, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/resolvelib/resolvers.py", line 427, in resolve
failure_causes = self._attempt_to_pin_criterion(name)
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/resolvelib/resolvers.py", line 239, in _attempt_to_pin_criterion
criteria = self._get_updated_criteria(candidate)
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/resolvelib/resolvers.py", line 229, in _get_updated_criteria
for requirement in self._p.get_dependencies(candidate=candidate):
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/resolution.py", line 644, in get_dependencies
return list(self._iter_dependencies(candidate))
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/resolution.py", line 635, in _iter_dependencies
for r in self.get_requirements_for_package(purl=purl, candidate=candidate):
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/resolution.py", line 497, in get_requirements_for_package_from_pypi_simple
yield from get_reqs_insecurely(
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/resolution.py", line 277, in get_reqs_insecurely
yield from parse_reqs_from_setup_py_insecurely(setup_py=setup_py_location)
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/resolution.py", line 128, in parse_reqs_from_setup_py_insecurely
for req in iter_requirements(level="", extras=[], setup_file=setup_py):
File "/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/python_inspector/setup_py_live_eval.py", line 117, in iter_requirements
exec(file_contents, g)
File "", line 6, in
ImportError: cannot import name 'Feature' from 'setuptools' (/Users/bom1wa3/Library/Python/3.9/lib/python/site-packages/setuptools/__init__.py)
```