Remove parse_dependencies from setup.py

[aarontp]

It looks like the pip API changed in recent versions and parse_requirements() is not supported as it is an internal only method.

Here are a couple related issues:
pypa/pip#5599
pypa/pip#7645

Part of the stacktrace:

    Traceback (most recent call last):
      File "setup.py", line 29, in <module>
        from pip._internal.download import PipSession
    ModuleNotFoundError: No module named 'pip._internal.download'
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "setup.py", line 32, in <module>
        from pip.download import PipSession
    ModuleNotFoundError: No module named 'pip.download'
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Here's the pip documentation linked from one of the bugs:
https://pip.pypa.io/en/stable/user_guide/#using-pip-from-your-program

[aarontp]

Looks like Timesketch has a similar issue, but Plaso/dftimewolf use different mechanisms.
google/timesketch#1094

[loganbek]

hitting similar.

[aarontp]

Temporary fix is in #493, and I'll patch it into the release branch and cut a release later today.

[aarontp]

Release branch and new release pushed. Will keep this open to track a longer term fix to remove using pip from setuptools at all.

[aarontp]

This was fixed in #524