Use pants managed venv in Makefile

[cognifloyd]

I don't intend to merge this. I want to use this to find any issues with the requirements pants is using and limit them appropriately. So, the changes to the Makefile are quite hacky.

[cognifloyd]

The pants-managed venv does not have PyOpenSSL.

• Apparently that was pulled in by requests[security] which was disabled in:
  • requests 2.24 (https://github.com/psf/requests/pull/5443):
    • eww. I didn't realize that the urllib3 module was getting monkey patched with pyopenssl.
  • requests 2.25 (https://github.com/psf/requests/pull/5867)

I don't know if that's related to the timeouts in the integration tests or not.

Nope. That's irrelevant because we're already pinned to requests==2.25.1, so we're only getting pyopenssl because of our pin now. If we dropped that it would probably go away. We can also drop the [security] extra since it does nothing.