upgrade requests to >=2.31.0

[lmgarret]

Hi! requests 2.31.0 addresses some security issues that affect versions v2.3.0 and v2.30.0. Upgrading domonic's dependency would be nice.
For context, we use domonic as a dev dependency in our stack to locally produce some html documentation files, but cannot upgrade requests since domonic has the requirement requests~=2.28.0.

Which makes me think, would it be possible to make requests as an extra dependency for people who want to load remote html? e.g. in our case we're not interested in this feature, but I see what it could be used for and I would find it reasonable to pip install domonic[requestes] if I wanted to use this feature.

Thanks!

[byteface]

FAILED tests/test_javascript_date.py::TestCase::test_getTime - assert 787021200000 == 787017600000
FAILED tests/test_javascript_date.py::TestCase::test_javascript_date - assert 1 == 0
FAILED tests/test_webapi.py::TestCase::test_xpath - requests.exceptions.ConnectTimeout: HTTPConnectionPool(host='eventual.technology', port=80): Max retries exceeded with url: / (Caused by Co...
================================================== 3 failed, 506 passed in 548.60s (0:09:08) ===================================================

Need to investigate the failed tests here....