Removing unused SETUP_CFG path variable

[jamesbraza]

#1971 removed setup.cfg, this PR just removes an unused Path variable for it

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[jamesbraza]

The CI failure is a flaky test unrelated to this PR. I don't have permissions to re-run CI failed jobs. (Cc @Wauplin) if you can re-run for me, or give me permissions to re-run it

[Wauplin]

Thanks @jamesbraza! Failed test is unrelated indeed. I'll have to investigate it. It's not a flaky test, it's also failing in other PRs. I suspect a version update in keras/tensorflow. Anyway, not related so let's merge this!

[jamesbraza]

Yeah looking at the pip freeze of the failed CI job:

...
tb-nightly==2.16.0a20240118
tensorboard-data-server==0.7.2
tensorflow==2.16.0
tensorflow-io-gcs-filesystem==0.35.0
...
tf-estimator-nightly==2.14.0.dev2023080308
tf_keras-nightly==2.16.0.dev2024011811
...

For some reason it's installing the nightly version of 2.16, which doesn't make sense to me because that's not what setup.py calls out for the tensorflow extra. The only place tf-nightly is mentioned is in utils/_runtime.py.

Anyways, feel free to tag me on a PR for the fix, if you can figure it out