Removed dependency on the pytz library.

[spillner]

Most of the Pytz functionality is now available in the standard library in 3.8 and greater, and the Pytz (https://pypi.org/project/pytz/) project has gone into maintenance mode and is no longer recommended for new projects. I noticed that OWSLib was using Pytz only to annotate timestamps as UTC, which doesn't even require the expanded tzinfo support from 3.8/3.9+; the attached patch supports Python 2 (at least Python 2.7) as well.

[github-actions]

This Pull Request has been inactive for 90 days. In order to manage maintenance burden, it will be automatically closed in 7 days.

[spillner]

Pinging the issue to prevent an auto-close. It looks like the CI pipelines were timing out due to a test harness issue that has nothing to do with this change, and the "conflict" in requirements.txt is a fundamental part of the patch.

Anyway, LMK if there's anything else you're looking for me to do to package this up.

[geographika]

Thanks @spillner for this.
Python2 support has been dropped - and OWSLib requires Python 3.10 -

OWSLib/setup.py

Line 92 in b9cd08b

python_requires='>=3.10',

- does this make the patch even simpler?

[geographika]

@spillner - the merge conflict is due to python-dateutil>=1.5 - the version can be removed so it looks as follows, and the CI should pass:

lxml
python-dateutil
pyyaml
requests