flash-attn (2.3.0) not supporting PEP 517 builds

[JPonsa]

Same as #209

pip wheel --no-cache-dir --use-pep517 "flash-attn (==2.5.7)"

Traceback (most recent call last):
        File "/lustre/scratch/scratch/<user_id>/ctgov_rag/.venv/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "/lustre/scratch/scratch/<user_id>/ctgov_rag/.venv/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/lustre/scratch/scratch/<user_id>/ctgov_rag/.venv/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^
        File "/tmpdir/job/478480.undefined/pip-build-env-qij0qha8/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 325, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmpdir/job/478480.undefined/pip-build-env-qij0qha8/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 295, in _get_build_requires
          self.run_setup()
        File "/tmpdir/job/478480.undefined/pip-build-env-qij0qha8/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 487, in run_setup
          super().run_setup(setup_script=setup_script)
        File "/tmpdir/job/478480.undefined/pip-build-env-qij0qha8/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 311, in run_setup
          exec(code, locals())
        File "<string>", line 9, in <module>
      ModuleNotFoundError: No module named 'packaging'