devel/py-virtualenv: Update to 20.35.3

• Mark as broken the test tests/unit/create/via_global_ref/test_build_c_ext.py that fails with the following error:
  
  ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none) ERROR: No matching distribution found for setuptools>=40.8.0

Release changes: https://github.com/pypa/virtualenv/releases/tag/20.35.3
Reported by: Bernát Gábor <notifications@github.com>