Increase REQUEST_TIMEOUT or make configurable

[Kaiser1989]

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• [x ] I have searched the FAQ and general documentation and believe that my question is not already covered.

Feature Request

When trying to publish my python artifacts with poetry, running poetry publish we run into timeouts:

- Uploading xxx-py3-none-win_amd64.whl 0%
- Uploading xxx-py3-none-win_amd64.whl 100%
HTTPSConnectionPool(host='artifacts.pp-intern.tools', port=443): Read timed out. (read timeout=15)

Tried to configure it. After some investigation I found the cause for this. Poetry uses library requests and there is a hardcoded 15s timeout in constants.py: https://github.com/python-poetry/poetry/blob/master/src/poetry/utils/constants.py

Solution:
Either increase this value (e.g. 60s), or make it configureable, maybe by an env:var or by some config value.

[neersighted]

Duplicate #6009.

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