Update setuptools and use get-pip correctly to fix Cryptography build

[Safihre]

As discussed in #5307 and #4153.
Turns out we need to update setuptools.
I also found that our usage of get-pip.py was wrong: it can't be used to specify the pip version, it always installs whatever they have update the script to.
But by skipping setuptools and wheel in get-pip.py, we can make sure we fix those versions at least.

Successful build of SABnzbd (setup and runs):
https://github.com/Safihre/spksrc/actions/runs/2514098758

[th0ma7]

@Safihre now I get it, great catch! I recall seing messages that it was replacing a version with another on the subsequent install of wheel and setuptools and that explains it now. Good job!

[th0ma7]

I've restarted the github-action checks to confirm all is good but at first glance this LGTM.

[publicarray]

Good work! However, I would like the builds for python to succeed.

[Safihre]

I saw 😢 , making changes in a separate branch to fix. Will push when fixed :)

[Safihre]

@hgy59 @publicarray @th0ma7 I fixed python38, but python3 kept failing. I checked and no native/cross/spk uses python3 so I just.. removed it?
Any objections?

[th0ma7]

but python3 kept failing. I checked and no native/cross/spk uses python3 so I just.. removed it? Any objections?

I double checked and indeed it doesn't looked used anymore. So no objection at all besides updating python310 status page #5043

[Safihre]

Build succeeded:
https://github.com/Safihre/spksrc/actions/runs/2519752159

[hgy59]

@Safihre sorry, as I am too late for the show.
There is nothing wrong with get-pip.py "pip==22.0.4"

I have reintroduced this with #5318.

[hgy59]

I also found that our usage of get-pip.py was wrong: it can't be used to specify the pip version, it always installs whatever they have update the script to.

Additional parameters to pip-get.py are documented https://github.com/pypa/get-pip

Upon execution, get-pip.py will install pip, setuptools and wheel in the current Python environment.

It is possible to provide additional arguments to the underlying script. These are passed through to the underlying pip install command, and can thus be used to constraint the versions of the packages, or to pass other pip options such as --no-index.

$ python get-pip.py "pip < 21.0" "setuptools < 50.0" "wheel < 1.0"
$ python get-pip.py --no-index --find-links=/local/copies

[Safihre]

Hmm, strange that I saw in the logs that it wasn't installing the version we specify. I must have misunderstood the logging.

[hgy59]

Hmm, strange that I saw in the logs that it wasn't installing the version we specify. I must have misunderstood the logging.

AFAICR there was "pip = 20.0.4" (single eq) once in your PR...