Use shiv to create the virtualenv exe
Use shiv to create the virtualenv exe

The bundle was failing:

```console
andy at Andy-Freeland-Pro in ~/gr/gold on git:develop+?
$ mktmpenv
Traceback (most recent call last):
  File "/usr/local/Cellar/python@3.8/3.8.6_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/local/Cellar/python@3.8/3.8.6_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/Users/andy/.local/bin/virtualenv/__main__.py", line 168, in <module>
  File "/Users/andy/.local/bin/virtualenv/__main__.py", line 164, in run
  File "/Users/andy/.local/bin/virtualenv/virtualenv/__main__.py", line 16, in run
  File "/Users/andy/.local/bin/virtualenv/virtualenv/run/__init__.py", line 28, in cli_run
  File "/Users/andy/.local/bin/virtualenv/virtualenv/run/session.py", line 46, in run
  File "/Users/andy/.local/bin/virtualenv/virtualenv/run/session.py", line 53, in _create
  File "/Users/andy/.local/bin/virtualenv/virtualenv/create/creator.py", line 161, in run
  File "/Users/andy/.local/bin/virtualenv/virtualenv/create/via_global_ref/builtin/via_global_self_do.py", line 101, in create
  File "/Users/andy/.local/bin/virtualenv/virtualenv/create/via_global_ref/api.py", line 89, in create
  File "/Users/andy/.local/bin/virtualenv/virtualenv/create/via_global_ref/api.py", line 92, in install_patch
  File "/Users/andy/.local/bin/virtualenv/virtualenv/create/via_global_ref/builtin/cpython/cpython3.py", line 27, in env_patch_text
  File "/Users/andy/.local/bin/virtualenv/virtualenv/create/via_global_ref/api.py", line 103, in env_patch_text
  File "/usr/local/Cellar/python@3.8/3.8.6_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "/Users/andy/.local/bin/virtualenv/virtualenv/app_data/base.py", line 54, in ensure_extracted
  File "/usr/local/Cellar/python@3.8/3.8.6_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "/Users/andy/.local/bin/virtualenv/virtualenv/app_data/via_disk_folder.py", line 81, in extract
  File "/Users/andy/.local/bin/virtualenv/virtualenv/util/zipapp.py", line 22, in extract

  File "/usr/local/Cellar/python@3.8/3.8.6_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/zipfile.py", line 1441, in getinfo
    raise KeyError(
KeyError: "There is no item named 'bal_ref/_virtualenv.py' in the archive"
Error: error creating virtualenv
```

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