Relax tests requirements

[rominf]

Issue Summary

I'm a Fedora packager for python3-twilio. I get an error during build process related with too strict version pinning for mock and sphinx. I don't think this is necessary: I've made a patch which removes pinning, and hence mock 4.0.3 and Sphinx 4.4.0 are installed. And the tests pass. Consider removing the pinning, or at least, make it use >= operator. It'll make lives of packagers easier.

Exception/Log

...
No matching package to install: 'python3dist(mock) = 0.8'
Package python3-packaging-21.3-2.fc36.noarch is already installed.
Package python3-pip-22.0.4-1.fc37.noarch is already installed.
Package python3-setuptools-60.9.3-1.fc37.noarch is already installed.
No matching package to install: 'python3dist(sphinx) = 1.8'
...

Technical details:

• twilio-python version: 7.8.0
• python version: 3.10

[childish-sambino]

This issue has been added to our internal backlog to be prioritized. Pull requests and +1s on the issue summary will help it move up the backlog.

[paulwouters]

+1