fix: runtime error on six dependency

[gigatim]

Fixes #104

[jank]

@gigatim - this resolves the issue of the missing six dependency. However, after installing Gigalixir into a fresh venv (Python 3.12 on macOS) setuptools is still missing. Running gigalixir --help after fresh installation produces:

Traceback (most recent call last):
  File ".../giga_example/giga/bin/gigalixir", line 5, in <module>
    from gigalixir import cli
  File ".../Code/giga_example/giga/lib/python3.12/site-packages/gigalixir/__init__.py", line 42, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

Running pip install setuptools fixes this issue. So I assume this dependency must be explicitly added.

[gigatim]

@jank what version of setuptools do you end up installing? You can run pip list to get the version.

[jank]

I have the following version installed setuptools 69.0.2:

Package            Version
------------------ ------------
certifi            2023.11.17
cffi               1.16.0
charset-normalizer 3.3.2
click              8.1.7
cryptography       41.0.5
gigalixir          1.9.1
idna               3.4
pip                23.3.1
pycparser          2.21
Pygments           2.17.2
pyOpenSSL          23.3.0
pypng              0.20220715.0
qrcode             7.4.2
requests           2.31.0
rollbar            1.0.0
setuptools         69.0.2
six                1.16.0
stripe             7.6.0
typing_extensions  4.8.0
urllib3            2.1.0```

[gigatim]

@jank we will look into this further... related, we did get the homebrew formula updated for 1.9.1, which has been tested on M1

[gigatim]

v1.9.3 resolves this issue fully